--- _id: '13359' abstract: - lang: eng text: Dissipative self-assembly is ubiquitous in nature, where it gives rise to complex structures and functions such as self-healing, homeostasis, and camouflage. These phenomena are enabled by the continuous conversion of energy stored in chemical fuels, such as ATP. Over the past decade, an increasing number of synthetic chemically driven systems have been reported that mimic the features of their natural counterparts. At the same time, it has been shown that dissipative self-assembly can also be fueled by light; these optically fueled systems have been developed in parallel to the chemically fueled ones. In this perspective, we critically compare these two classes of systems. Despite the complementarity and fundamental differences between these two modes of dissipative self-assembly, our analysis reveals that multiple analogies exist between chemically and light-fueled systems. We hope that these considerations will facilitate further development of the field of dissipative self-assembly. article_processing_charge: No article_type: original author: - first_name: Maren full_name: Weißenfels, Maren last_name: Weißenfels - first_name: Julius full_name: Gemen, Julius last_name: Gemen - first_name: Rafal full_name: Klajn, Rafal id: 8e84690e-1e48-11ed-a02b-a1e6fb8bb53b last_name: Klajn citation: ama: 'Weißenfels M, Gemen J, Klajn R. Dissipative self-assembly: Fueling with chemicals versus light. Chem. 2021;7(1):23-37. doi:10.1016/j.chempr.2020.11.025' apa: 'Weißenfels, M., Gemen, J., & Klajn, R. (2021). Dissipative self-assembly: Fueling with chemicals versus light. Chem. Elsevier. https://doi.org/10.1016/j.chempr.2020.11.025' chicago: 'Weißenfels, Maren, Julius Gemen, and Rafal Klajn. “Dissipative Self-Assembly: Fueling with Chemicals versus Light.” Chem. Elsevier, 2021. https://doi.org/10.1016/j.chempr.2020.11.025.' ieee: 'M. Weißenfels, J. Gemen, and R. Klajn, “Dissipative self-assembly: Fueling with chemicals versus light,” Chem, vol. 7, no. 1. Elsevier, pp. 23–37, 2021.' ista: 'Weißenfels M, Gemen J, Klajn R. 2021. Dissipative self-assembly: Fueling with chemicals versus light. Chem. 7(1), 23–37.' mla: 'Weißenfels, Maren, et al. “Dissipative Self-Assembly: Fueling with Chemicals versus Light.” Chem, vol. 7, no. 1, Elsevier, 2021, pp. 23–37, doi:10.1016/j.chempr.2020.11.025.' short: M. Weißenfels, J. Gemen, R. Klajn, Chem 7 (2021) 23–37. date_created: 2023-08-01T09:35:19Z date_published: 2021-01-14T00:00:00Z date_updated: 2024-10-14T12:12:18Z day: '14' doi: 10.1016/j.chempr.2020.11.025 extern: '1' intvolume: ' 7' issue: '1' keyword: - Materials Chemistry - Biochemistry (medical) - General Chemical Engineering - Environmental Chemistry - Biochemistry - General Chemistry language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1016/j.chempr.2020.11.025 month: '01' oa: 1 oa_version: Published Version page: 23-37 publication: Chem publication_identifier: issn: - 2451-9294 publication_status: published publisher: Elsevier quality_controlled: '1' scopus_import: '1' status: public title: 'Dissipative self-assembly: Fueling with chemicals versus light' type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 7 year: '2021' ... --- _id: '13360' abstract: - lang: eng text: 'Inorganic nanoparticles (NPs) exhibit a wide range of fascinating physicochemical properties, many of which can be controlled by modulating the NP–NP coupling. Controlling the self-assembly of NPs using light has traditionally been achieved by functionalizing their surfaces with monolayers of photoswitchable molecules, which can be reversibly isomerized between two or more states upon exposure to different wavelengths of light. NPs whose assembly can be controlled by light in a reversible fashion can find interesting applications. The chapter deals with systems comprising mixtures of non-photoswitchable NPs and small-molecule photoacids and photobases. Examples of light-controlled self-assembly of NPs hitherto reported have been categorized into six distinct approaches. These are: functionalizing NPs with monolayers of photoswitchable molecules, light-controlled adsorption/desorption of photoswitchable molecules onto NPs, and light-induced electron transfer between the particle''s inorganic core and the NP-bound ligands.' article_processing_charge: No author: - first_name: Tong full_name: Bian, Tong last_name: Bian - first_name: Zonglin full_name: Chu, Zonglin last_name: Chu - first_name: Rafal full_name: Klajn, Rafal id: 8e84690e-1e48-11ed-a02b-a1e6fb8bb53b last_name: Klajn citation: ama: 'Bian T, Chu Z, Klajn R. Controlling Self‐Assembly of Nanoparticles Using Light. In: Giuseppone N, Walther A, eds. Out‐of‐Equilibrium (Supra)Molecular Systems and Materials. Wiley; 2021:241-273. doi:10.1002/9783527821990.ch9' apa: Bian, T., Chu, Z., & Klajn, R. (2021). Controlling Self‐Assembly of Nanoparticles Using Light. In N. Giuseppone & A. Walther (Eds.), Out‐of‐Equilibrium (Supra)molecular Systems and Materials (pp. 241–273). Wiley. https://doi.org/10.1002/9783527821990.ch9 chicago: Bian, Tong, Zonglin Chu, and Rafal Klajn. “Controlling Self‐Assembly of Nanoparticles Using Light.” In Out‐of‐Equilibrium (Supra)Molecular Systems and Materials, edited by Nicolas Giuseppone and Andreas Walther, 241–73. Wiley, 2021. https://doi.org/10.1002/9783527821990.ch9. ieee: T. Bian, Z. Chu, and R. Klajn, “Controlling Self‐Assembly of Nanoparticles Using Light,” in Out‐of‐Equilibrium (Supra)molecular Systems and Materials, N. Giuseppone and A. Walther, Eds. Wiley, 2021, pp. 241–273. ista: 'Bian T, Chu Z, Klajn R. 2021.Controlling Self‐Assembly of Nanoparticles Using Light. In: Out‐of‐Equilibrium (Supra)molecular Systems and Materials. , 241–273.' mla: Bian, Tong, et al. “Controlling Self‐Assembly of Nanoparticles Using Light.” Out‐of‐Equilibrium (Supra)Molecular Systems and Materials, edited by Nicolas Giuseppone and Andreas Walther, Wiley, 2021, pp. 241–73, doi:10.1002/9783527821990.ch9. short: T. Bian, Z. Chu, R. Klajn, in:, N. Giuseppone, A. Walther (Eds.), Out‐of‐Equilibrium (Supra)Molecular Systems and Materials, Wiley, 2021, pp. 241–273. date_created: 2023-08-01T09:35:35Z date_published: 2021-04-19T00:00:00Z date_updated: 2024-10-14T12:09:48Z day: '19' doi: 10.1002/9783527821990.ch9 editor: - first_name: Nicolas full_name: Giuseppone, Nicolas last_name: Giuseppone - first_name: Andreas full_name: Walther, Andreas last_name: Walther extern: '1' language: - iso: eng month: '04' oa_version: None page: 241-273 publication: Out‐of‐Equilibrium (Supra)molecular Systems and Materials publication_identifier: eisbn: - '9783527821990' isbn: - '9783527346158' publication_status: published publisher: Wiley quality_controlled: '1' scopus_import: '1' status: public title: Controlling Self‐Assembly of Nanoparticles Using Light type: book_chapter user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2021' ... --- _id: '13453' abstract: - lang: eng text: Most massive stars are born in binaries close enough for mass transfer episodes. These modify the appearance, structure, and future evolution of both stars. We compute the evolution of a 100-day-period binary, consisting initially of a 25 M⊙ star and a 17 M⊙ star, which experiences stable mass transfer. We focus on the impact of mass accretion on the surface composition, internal rotation, and structure of the accretor. To anchor our models, we show that our accretor broadly reproduces the properties of ζ Ophiuchi, which has long been proposed to have accreted mass before being ejected as a runaway star when the companion exploded. We compare our accretor to models of single rotating stars and find that the later and stronger spin-up provided by mass accretion produces significant differences. Specifically, the core of the accretor retains higher spin at the end of the main sequence, and a convective layer develops that changes its density profile. Moreover, the surface of the accretor star is polluted by CNO-processed material donated by the companion. Our models show effects of mass accretion in binaries that are not captured in single rotating stellar models. This possibly impacts the further evolution (either in a binary or as single stars), the final collapse, and the resulting spin of the compact object. article_number: '277' article_processing_charge: No article_type: original arxiv: 1 author: - first_name: M. full_name: Renzo, M. last_name: Renzo - first_name: Ylva Louise Linsdotter full_name: Götberg, Ylva Louise Linsdotter id: d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d last_name: Götberg orcid: 0000-0002-6960-6911 citation: ama: 'Renzo M, Götberg YLL. Evolution of accretor stars in massive binaries: Broader implications from modeling ζ Ophiuchi. The Astrophysical Journal. 2021;923(2). doi:10.3847/1538-4357/ac29c5' apa: 'Renzo, M., & Götberg, Y. L. L. (2021). Evolution of accretor stars in massive binaries: Broader implications from modeling ζ Ophiuchi. The Astrophysical Journal. American Astronomical Society. https://doi.org/10.3847/1538-4357/ac29c5' chicago: 'Renzo, M., and Ylva Louise Linsdotter Götberg. “Evolution of Accretor Stars in Massive Binaries: Broader Implications from Modeling ζ Ophiuchi.” The Astrophysical Journal. American Astronomical Society, 2021. https://doi.org/10.3847/1538-4357/ac29c5.' ieee: 'M. Renzo and Y. L. L. Götberg, “Evolution of accretor stars in massive binaries: Broader implications from modeling ζ Ophiuchi,” The Astrophysical Journal, vol. 923, no. 2. American Astronomical Society, 2021.' ista: 'Renzo M, Götberg YLL. 2021. Evolution of accretor stars in massive binaries: Broader implications from modeling ζ Ophiuchi. The Astrophysical Journal. 923(2), 277.' mla: 'Renzo, M., and Ylva Louise Linsdotter Götberg. “Evolution of Accretor Stars in Massive Binaries: Broader Implications from Modeling ζ Ophiuchi.” The Astrophysical Journal, vol. 923, no. 2, 277, American Astronomical Society, 2021, doi:10.3847/1538-4357/ac29c5.' short: M. Renzo, Y.L.L. Götberg, The Astrophysical Journal 923 (2021). date_created: 2023-08-03T10:10:48Z date_published: 2021-12-29T00:00:00Z date_updated: 2023-08-21T11:59:34Z day: '29' doi: 10.3847/1538-4357/ac29c5 extern: '1' external_id: arxiv: - '2107.10933' intvolume: ' 923' issue: '2' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2107.10933 month: '12' oa: 1 oa_version: Preprint publication: The Astrophysical Journal publication_identifier: eissn: - 1538-4357 issn: - 0004-637X publication_status: published publisher: American Astronomical Society quality_controlled: '1' scopus_import: '1' status: public title: 'Evolution of accretor stars in massive binaries: Broader implications from modeling ζ Ophiuchi' type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 923 year: '2021' ... --- _id: '13454' abstract: - lang: eng text: Helium star–carbon-oxygen white dwarf (CO WD) binaries are potential single-degenerate progenitor systems of thermonuclear supernovae. Revisiting a set of binary evolution calculations using the stellar evolution code MESA, we refine our previous predictions about which systems can lead to a thermonuclear supernova and then characterize the properties of the helium star donor at the time of explosion. We convert these model properties to near-UV/optical magnitudes assuming a blackbody spectrum and support this approach using a matched stellar atmosphere model. These models will be valuable to compare with pre-explosion imaging for future supernovae, though we emphasize the observational difficulty of detecting extremely blue companions. The pre-explosion source detected in association with SN 2012Z has been interpreted as a helium star binary containing an initially ultra-massive WD in a multiday orbit. However, extending our binary models to initial CO WD masses of up to 1.2 M⊙, we find that these systems undergo off-center carbon ignitions and thus are not expected to produce thermonuclear supernovae. This tension suggests that, if SN 2012Z is associated with a helium star–WD binary, then the pre-explosion optical light from the system must be significantly modified by the binary environment and/or the WD does not have a carbon-rich interior composition. article_number: '241' article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Tin Long Sunny full_name: Wong, Tin Long Sunny last_name: Wong - first_name: Josiah full_name: Schwab, Josiah last_name: Schwab - first_name: Ylva Louise Linsdotter full_name: Götberg, Ylva Louise Linsdotter id: d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d last_name: Götberg orcid: 0000-0002-6960-6911 citation: ama: Wong TLS, Schwab J, Götberg YLL. Pre-explosion properties of Helium star donors to thermonuclear supernovae. The Astrophysical Journal. 2021;922(2). doi:10.3847/1538-4357/ac27ae apa: Wong, T. L. S., Schwab, J., & Götberg, Y. L. L. (2021). Pre-explosion properties of Helium star donors to thermonuclear supernovae. The Astrophysical Journal. American Astronomical Society. https://doi.org/10.3847/1538-4357/ac27ae chicago: Wong, Tin Long Sunny, Josiah Schwab, and Ylva Louise Linsdotter Götberg. “Pre-Explosion Properties of Helium Star Donors to Thermonuclear Supernovae.” The Astrophysical Journal. American Astronomical Society, 2021. https://doi.org/10.3847/1538-4357/ac27ae. ieee: T. L. S. Wong, J. Schwab, and Y. L. L. Götberg, “Pre-explosion properties of Helium star donors to thermonuclear supernovae,” The Astrophysical Journal, vol. 922, no. 2. American Astronomical Society, 2021. ista: Wong TLS, Schwab J, Götberg YLL. 2021. Pre-explosion properties of Helium star donors to thermonuclear supernovae. The Astrophysical Journal. 922(2), 241. mla: Wong, Tin Long Sunny, et al. “Pre-Explosion Properties of Helium Star Donors to Thermonuclear Supernovae.” The Astrophysical Journal, vol. 922, no. 2, 241, American Astronomical Society, 2021, doi:10.3847/1538-4357/ac27ae. short: T.L.S. Wong, J. Schwab, Y.L.L. Götberg, The Astrophysical Journal 922 (2021). date_created: 2023-08-03T10:10:58Z date_published: 2021-12-03T00:00:00Z date_updated: 2023-08-21T11:52:05Z day: '03' doi: 10.3847/1538-4357/ac27ae extern: '1' external_id: arxiv: - '2109.14817' intvolume: ' 922' issue: '2' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2109.14817 month: '12' oa: 1 oa_version: Preprint publication: The Astrophysical Journal publication_identifier: eissn: - 1538-4357 issn: - 0004-637X publication_status: published publisher: American Astronomical Society quality_controlled: '1' scopus_import: '1' status: public title: Pre-explosion properties of Helium star donors to thermonuclear supernovae type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 922 year: '2021' ... --- _id: '13455' abstract: - lang: eng text: The majority of massive stars live in binary or multiple systems and will interact with a companion during their lifetimes, which helps to explain the observed diversity of core-collapse supernovae. Donor stars in binary systems can lose most of their hydrogen-rich envelopes through mass transfer. As a result, not only are the surface properties affected, but so is the core structure. However, most calculations of the core-collapse properties of massive stars rely on single-star models. We present a systematic study of the difference between the pre-supernova structures of single stars and stars of the same initial mass (11–21 M⊙) that have been stripped due to stable post-main-sequence mass transfer at solar metallicity. We present the pre-supernova core composition with novel diagrams that give an intuitive representation of the isotope distribution. As shown in previous studies, at the edge of the carbon-oxygen core, the binary-stripped star models contain an extended gradient of carbon, oxygen, and neon. This layer remains until core collapse and is more extended in mass for higher initial stellar masses. It originates from the receding of the convective helium core during core helium burning in binary-stripped stars, which does not occur in single-star models. We find that this same evolutionary phase leads to systematic differences in the final density and nuclear energy generation profiles. Binary-stripped star models have systematically higher total masses of carbon at the moment of core collapse compared to single-star models, which likely results in systematically different supernova yields. In about half of our models, the silicon-burning and oxygen-rich layers merge after core silicon burning. We discuss the implications of our findings for the “explodability”, supernova observations, and nucleosynthesis of these stars. Our models are publicly available and can be readily used as input for detailed supernova simulations. article_number: A58 article_processing_charge: No article_type: original arxiv: 1 author: - first_name: E. full_name: Laplace, E. last_name: Laplace - first_name: S. full_name: Justham, S. last_name: Justham - first_name: M. full_name: Renzo, M. last_name: Renzo - first_name: Ylva Louise Linsdotter full_name: Götberg, Ylva Louise Linsdotter id: d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d last_name: Götberg orcid: 0000-0002-6960-6911 - first_name: R. full_name: Farmer, R. last_name: Farmer - first_name: D. full_name: Vartanyan, D. last_name: Vartanyan - first_name: S. E. full_name: de Mink, S. E. last_name: de Mink citation: ama: 'Laplace E, Justham S, Renzo M, et al. Different to the core: The pre-supernova structures of massive single and binary-stripped stars. Astronomy & Astrophysics. 2021;656. doi:10.1051/0004-6361/202140506' apa: 'Laplace, E., Justham, S., Renzo, M., Götberg, Y. L. L., Farmer, R., Vartanyan, D., & de Mink, S. E. (2021). Different to the core: The pre-supernova structures of massive single and binary-stripped stars. Astronomy & Astrophysics. EDP Sciences. https://doi.org/10.1051/0004-6361/202140506' chicago: 'Laplace, E., S. Justham, M. Renzo, Ylva Louise Linsdotter Götberg, R. Farmer, D. Vartanyan, and S. E. de Mink. “Different to the Core: The Pre-Supernova Structures of Massive Single and Binary-Stripped Stars.” Astronomy & Astrophysics. EDP Sciences, 2021. https://doi.org/10.1051/0004-6361/202140506.' ieee: 'E. Laplace et al., “Different to the core: The pre-supernova structures of massive single and binary-stripped stars,” Astronomy & Astrophysics, vol. 656. EDP Sciences, 2021.' ista: 'Laplace E, Justham S, Renzo M, Götberg YLL, Farmer R, Vartanyan D, de Mink SE. 2021. Different to the core: The pre-supernova structures of massive single and binary-stripped stars. Astronomy & Astrophysics. 656, A58.' mla: 'Laplace, E., et al. “Different to the Core: The Pre-Supernova Structures of Massive Single and Binary-Stripped Stars.” Astronomy & Astrophysics, vol. 656, A58, EDP Sciences, 2021, doi:10.1051/0004-6361/202140506.' short: E. Laplace, S. Justham, M. Renzo, Y.L.L. Götberg, R. Farmer, D. Vartanyan, S.E. de Mink, Astronomy & Astrophysics 656 (2021). date_created: 2023-08-03T10:11:09Z date_published: 2021-12-02T00:00:00Z date_updated: 2025-01-14T14:11:32Z day: '02' doi: 10.1051/0004-6361/202140506 extern: '1' external_id: arxiv: - '2102.05036' intvolume: ' 656' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1051/0004-6361/202140506 month: '12' oa: 1 oa_version: Published Version publication: Astronomy & Astrophysics publication_identifier: eissn: - 1432-0746 issn: - 0004-6361 publication_status: published publisher: EDP Sciences quality_controlled: '1' scopus_import: '1' status: public title: 'Different to the core: The pre-supernova structures of massive single and binary-stripped stars' type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 656 year: '2021' ... --- _id: '13456' abstract: - lang: eng text: While most simulations of the epoch of reionization have focused on single-stellar populations in star-forming dwarf galaxies, products of binary evolution are expected to significantly contribute to emissions of hydrogen-ionizing photons. Among these products are stripped stars (or helium stars), which have their envelopes stripped from interactions with binary companions, leaving an exposed helium core. Previous work has suggested these stripped stars can dominate the Lyman Continuum (LyC) photon output of high-redshift, low-luminosity galaxies post-starburst. Other sources of hard radiation in the early universe include zero-metallicity Population iii stars, which may have similar spectral energy distribution (SED) properties to galaxies with radiation dominated by stripped-star emissions. Here, we use four metrics (the power-law exponent over wavelength intervals 240–500 Å, 600–900 Å, and 1200–2000 Å, and the ratio of total luminosity in FUV wavelengths to LyC wavelengths) to compare the SEDs of simulated galaxies with only single-stellar evolution, galaxies containing stripped stars, and galaxies containing Population iii stars, with four different initial mass functions (IMFs). We find that stripped stars significantly alter SEDs in the LyC range of galaxies at the epoch of reionization. SEDs in galaxies with stripped stars have lower power-law indices in the LyC range and lower FUV to LyC luminosity ratios. These differences in SEDs are present at all considered luminosities (${M}_{\mathrm{UV}}\gt -15$, AB system), and are most pronounced for lower-luminosity galaxies. Intrinsic SEDs as well as those with interstellar medium absorption of galaxies with stripped stars and Population iii stars are found to be distinct for all tested Population iii IMFs. article_number: '5' article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Elizabeth full_name: Berzin, Elizabeth last_name: Berzin - first_name: Amy full_name: Secunda, Amy last_name: Secunda - first_name: Renyue full_name: Cen, Renyue last_name: Cen - first_name: Alexander full_name: Menegas, Alexander last_name: Menegas - first_name: Ylva Louise Linsdotter full_name: Götberg, Ylva Louise Linsdotter id: d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d last_name: Götberg orcid: 0000-0002-6960-6911 citation: ama: Berzin E, Secunda A, Cen R, Menegas A, Götberg YLL. Spectral signatures of population III and envelope-stripped stars in galaxies at the epoch of reionization. The Astrophysical Journal. 2021;918(1). doi:10.3847/1538-4357/ac0af6 apa: Berzin, E., Secunda, A., Cen, R., Menegas, A., & Götberg, Y. L. L. (2021). Spectral signatures of population III and envelope-stripped stars in galaxies at the epoch of reionization. The Astrophysical Journal. American Astronomical Society. https://doi.org/10.3847/1538-4357/ac0af6 chicago: Berzin, Elizabeth, Amy Secunda, Renyue Cen, Alexander Menegas, and Ylva Louise Linsdotter Götberg. “Spectral Signatures of Population III and Envelope-Stripped Stars in Galaxies at the Epoch of Reionization.” The Astrophysical Journal. American Astronomical Society, 2021. https://doi.org/10.3847/1538-4357/ac0af6. ieee: E. Berzin, A. Secunda, R. Cen, A. Menegas, and Y. L. L. Götberg, “Spectral signatures of population III and envelope-stripped stars in galaxies at the epoch of reionization,” The Astrophysical Journal, vol. 918, no. 1. American Astronomical Society, 2021. ista: Berzin E, Secunda A, Cen R, Menegas A, Götberg YLL. 2021. Spectral signatures of population III and envelope-stripped stars in galaxies at the epoch of reionization. The Astrophysical Journal. 918(1), 5. mla: Berzin, Elizabeth, et al. “Spectral Signatures of Population III and Envelope-Stripped Stars in Galaxies at the Epoch of Reionization.” The Astrophysical Journal, vol. 918, no. 1, 5, American Astronomical Society, 2021, doi:10.3847/1538-4357/ac0af6. short: E. Berzin, A. Secunda, R. Cen, A. Menegas, Y.L.L. Götberg, The Astrophysical Journal 918 (2021). date_created: 2023-08-03T10:11:24Z date_published: 2021-08-27T00:00:00Z date_updated: 2023-08-21T11:44:50Z day: '27' doi: 10.3847/1538-4357/ac0af6 extern: '1' external_id: arxiv: - '2102.08408' intvolume: ' 918' issue: '1' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.3847/1538-4357/ac0af6 month: '08' oa: 1 oa_version: Published Version publication: The Astrophysical Journal publication_identifier: eissn: - 1538-4357 issn: - 0004-637X publication_status: published publisher: American Astronomical Society quality_controlled: '1' scopus_import: '1' status: public title: Spectral signatures of population III and envelope-stripped stars in galaxies at the epoch of reionization type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 918 year: '2021' ... --- _id: '13457' abstract: - lang: eng text: "Context. Observations of massive stars in open clusters younger than ∼8 Myr have shown that a majority of them are in binary systems, most of which will interact during their life. While these can be used as a proxy of the initial multiplicity properties, studying populations of massive stars older than ∼20 Myr allows us to probe the outcome of these interactions after a significant number of systems have experienced mass and angular momentum transfer and may even have merged.\r\n\r\nAims. Using multi-epoch integral-field spectroscopy, we aim to investigate the multiplicity properties of the massive-star population in the dense core of the ∼40 Myr old cluster NGC 330 in the Small Magellanic Cloud in order to search for possible imprints of stellar evolution on the multiplicity properties.\r\n\r\nMethods. We obtained six epochs of VLT/MUSE observations operated in wide-field mode with the extended wavelength setup and supported by adaptive optics. We extracted spectra and measured radial velocities for stars brighter than mF814W = 19. We identified single-lined spectroscopic binaries through significant RV variability with a peak-to-peak amplitude larger than 20 km s−1. We also identified double-lined spectroscopic binaries, and quantified the observational biases for binary detection. In particular, we took into account that binary systems with similar line strengths are difficult to detect in our data set.\r\n\r\nResults. The observed spectroscopic binary fraction among stars brighter than mF814W = 19 (approximately 5.5 M⊙ on the main sequence) is fSBobs = 13.2 ± 2.0%. Considering period and mass ratio ranges from log(P) = 0.15−3.5 (about 1.4 to 3160 d), q = 0.1−1.0, and a representative set of orbital parameter distributions, we find a bias-corrected close binary fraction of fcl = 34−7+8%. This fraction seems to decline for the fainter stars, which indicates either that the close binary fraction drops in the B-type domain, or that the period distribution becomes more heavily weighted toward longer orbital periods. We further find that both fractions vary strongly in different regions of the color-magnitude diagram, which corresponds to different evolutionary stages. This probably reveals the imprint of the binary history of different groups of stars. In particular, we find that the observed spectroscopic binary fraction of Be stars (fSBobs = 2 ± 2%) is significantly lower than that of B-type stars (fSBobs = 9 ± 2%).\r\n\r\nConclusions. We provide the first homogeneous radial velocity study of a large sample of B-type stars at a low metallicity ([Fe/H] ≲ −1.0). The overall bias-corrected close binary fraction (log(P) < 3.5 d) of the B-star population in NGC 330 is lower than the fraction reported for younger Galactic and Large Magellanic Cloud clusters in previous works. More data are needed, however, to establish whether the observed differences are caused by an age or a metallicity effect." article_number: A70 article_processing_charge: No article_type: original arxiv: 1 author: - first_name: J. full_name: Bodensteiner, J. last_name: Bodensteiner - first_name: H. full_name: Sana, H. last_name: Sana - first_name: C. full_name: Wang, C. last_name: Wang - first_name: N. full_name: Langer, N. last_name: Langer - first_name: L. full_name: Mahy, L. last_name: Mahy - first_name: G. full_name: Banyard, G. last_name: Banyard - first_name: A. full_name: de Koter, A. last_name: de Koter - first_name: S. E. full_name: de Mink, S. E. last_name: de Mink - first_name: C. J. full_name: Evans, C. J. last_name: Evans - first_name: Ylva Louise Linsdotter full_name: Götberg, Ylva Louise Linsdotter id: d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d last_name: Götberg orcid: 0000-0002-6960-6911 - first_name: L. R. full_name: Patrick, L. R. last_name: Patrick - first_name: F. R. N. full_name: Schneider, F. R. N. last_name: Schneider - first_name: F. full_name: Tramper, F. last_name: Tramper citation: ama: Bodensteiner J, Sana H, Wang C, et al. The young massive SMC cluster NGC 330 seen by MUSE. II. Multiplicity properties of the massive-star population. Astronomy & Astrophysics. 2021;652. doi:10.1051/0004-6361/202140507 apa: Bodensteiner, J., Sana, H., Wang, C., Langer, N., Mahy, L., Banyard, G., … Tramper, F. (2021). The young massive SMC cluster NGC 330 seen by MUSE. II. Multiplicity properties of the massive-star population. Astronomy & Astrophysics. EDP Sciences. https://doi.org/10.1051/0004-6361/202140507 chicago: Bodensteiner, J., H. Sana, C. Wang, N. Langer, L. Mahy, G. Banyard, A. de Koter, et al. “The Young Massive SMC Cluster NGC 330 Seen by MUSE. II. Multiplicity Properties of the Massive-Star Population.” Astronomy & Astrophysics. EDP Sciences, 2021. https://doi.org/10.1051/0004-6361/202140507. ieee: J. Bodensteiner et al., “The young massive SMC cluster NGC 330 seen by MUSE. II. Multiplicity properties of the massive-star population,” Astronomy & Astrophysics, vol. 652. EDP Sciences, 2021. ista: Bodensteiner J, Sana H, Wang C, Langer N, Mahy L, Banyard G, de Koter A, de Mink SE, Evans CJ, Götberg YLL, Patrick LR, Schneider FRN, Tramper F. 2021. The young massive SMC cluster NGC 330 seen by MUSE. II. Multiplicity properties of the massive-star population. Astronomy & Astrophysics. 652, A70. mla: Bodensteiner, J., et al. “The Young Massive SMC Cluster NGC 330 Seen by MUSE. II. Multiplicity Properties of the Massive-Star Population.” Astronomy & Astrophysics, vol. 652, A70, EDP Sciences, 2021, doi:10.1051/0004-6361/202140507. short: J. Bodensteiner, H. Sana, C. Wang, N. Langer, L. Mahy, G. Banyard, A. de Koter, S.E. de Mink, C.J. Evans, Y.L.L. Götberg, L.R. Patrick, F.R.N. Schneider, F. Tramper, Astronomy & Astrophysics 652 (2021). date_created: 2023-08-03T10:11:34Z date_published: 2021-08-12T00:00:00Z date_updated: 2023-08-21T11:49:36Z day: '12' doi: 10.1051/0004-6361/202140507 extern: '1' external_id: arxiv: - '2104.13409' intvolume: ' 652' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1051/0004-6361/202140507 month: '08' oa: 1 oa_version: Published Version publication: Astronomy & Astrophysics publication_identifier: eissn: - 1432-0746 issn: - 0004-6361 publication_status: published publisher: EDP Sciences quality_controlled: '1' scopus_import: '1' status: public title: The young massive SMC cluster NGC 330 seen by MUSE. II. Multiplicity properties of the massive-star population type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 652 year: '2021' ... --- _id: '13458' abstract: - lang: eng text: Most massive stars experience binary interactions in their lifetimes that can alter both the surface and core structure of the stripped star with significant effects on their ultimate fate as core-collapse supernovae. However, core-collapse supernovae simulations to date have focused almost exclusively on the evolution of single stars. We present a systematic simulation study of single and binary-stripped stars with the same initial mass as candidates for core-collapse supernovae (11–21 M⊙). Generally, we find that binary-stripped stars core tend to have a smaller compactness parameter, with a more prominent, deeper silicon/oxygen interface, and explode preferentially to the corresponding single stars of the same initial mass. Such a dichotomy of behavior between these two modes of evolution would have important implications for supernovae statistics, including the final neutron star masses, explosion energies, and nucleosynthetic yields. Binary-stripped remnants are also well poised to populate the possible mass gap between the heaviest neutron stars and the lightest black holes. Our work presents an improvement along two fronts, as we self-consistently account for the pre-collapse stellar evolution and the subsequent explosion outcome. Even so, our results emphasize the need for more detailed stellar evolutionary models to capture the sensitive nature of explosion outcome. article_number: L5 article_processing_charge: No article_type: original arxiv: 1 author: - first_name: David full_name: Vartanyan, David last_name: Vartanyan - first_name: Eva full_name: Laplace, Eva last_name: Laplace - first_name: Mathieu full_name: Renzo, Mathieu last_name: Renzo - first_name: Ylva Louise Linsdotter full_name: Götberg, Ylva Louise Linsdotter id: d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d last_name: Götberg orcid: 0000-0002-6960-6911 - first_name: Adam full_name: Burrows, Adam last_name: Burrows - first_name: Selma E. full_name: de Mink, Selma E. last_name: de Mink citation: ama: Vartanyan D, Laplace E, Renzo M, Götberg YLL, Burrows A, de Mink SE. Binary-stripped stars as core-collapse supernovae progenitors. The Astrophysical Journal Letters. 2021;916(1). doi:10.3847/2041-8213/ac0b42 apa: Vartanyan, D., Laplace, E., Renzo, M., Götberg, Y. L. L., Burrows, A., & de Mink, S. E. (2021). Binary-stripped stars as core-collapse supernovae progenitors. The Astrophysical Journal Letters. American Astronomical Society. https://doi.org/10.3847/2041-8213/ac0b42 chicago: Vartanyan, David, Eva Laplace, Mathieu Renzo, Ylva Louise Linsdotter Götberg, Adam Burrows, and Selma E. de Mink. “Binary-Stripped Stars as Core-Collapse Supernovae Progenitors.” The Astrophysical Journal Letters. American Astronomical Society, 2021. https://doi.org/10.3847/2041-8213/ac0b42. ieee: D. Vartanyan, E. Laplace, M. Renzo, Y. L. L. Götberg, A. Burrows, and S. E. de Mink, “Binary-stripped stars as core-collapse supernovae progenitors,” The Astrophysical Journal Letters, vol. 916, no. 1. American Astronomical Society, 2021. ista: Vartanyan D, Laplace E, Renzo M, Götberg YLL, Burrows A, de Mink SE. 2021. Binary-stripped stars as core-collapse supernovae progenitors. The Astrophysical Journal Letters. 916(1), L5. mla: Vartanyan, David, et al. “Binary-Stripped Stars as Core-Collapse Supernovae Progenitors.” The Astrophysical Journal Letters, vol. 916, no. 1, L5, American Astronomical Society, 2021, doi:10.3847/2041-8213/ac0b42. short: D. Vartanyan, E. Laplace, M. Renzo, Y.L.L. Götberg, A. Burrows, S.E. de Mink, The Astrophysical Journal Letters 916 (2021). date_created: 2023-08-03T10:11:45Z date_published: 2021-07-23T00:00:00Z date_updated: 2023-08-21T11:37:48Z day: '23' doi: 10.3847/2041-8213/ac0b42 extern: '1' external_id: arxiv: - '2104.03317' intvolume: ' 916' issue: '1' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2104.03317 month: '07' oa: 1 oa_version: Preprint publication: The Astrophysical Journal Letters publication_identifier: eissn: - 2041-8213 issn: - 2041-8205 publication_status: published publisher: American Astronomical Society quality_controlled: '1' scopus_import: '1' status: public title: Binary-stripped stars as core-collapse supernovae progenitors type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 916 year: '2021' ... --- _id: '13459' abstract: - lang: eng text: The B emission-line stars are rapid rotators that were probably spun up by mass and angular momentum accretion through mass transfer in an interacting binary. Mass transfer will strip the donor star of its envelope to create a small and hot subdwarf remnant. Here we report on Hubble Space Telescope/STIS far-ultraviolet spectroscopy of a sample of Be stars that reveals the presence of the hot sdO companion through the calculation of cross-correlation functions of the observed and model spectra. We clearly detect the spectral signature of the sdO star in 10 of the 13 stars in the sample, and the spectral signals indicate that the sdO stars are hot, relatively faint, and slowly rotating as predicted by models. A comparison of their temperatures and radii with evolutionary tracks indicates that the sdO stars occupy the relatively long-lived, He-core burning stage. Only 1 of the 10 detections was a known binary prior to this investigation, which emphasizes the difficulty of finding such Be+sdO binaries through optical spectroscopy. However, these results and others indicate that many Be stars probably host hot subdwarf companions. article_number: '248' article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Luqian full_name: Wang, Luqian last_name: Wang - first_name: Douglas R. full_name: Gies, Douglas R. last_name: Gies - first_name: Geraldine J. full_name: Peters, Geraldine J. last_name: Peters - first_name: Ylva Louise Linsdotter full_name: Götberg, Ylva Louise Linsdotter id: d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d last_name: Götberg orcid: 0000-0002-6960-6911 - first_name: S. Drew full_name: Chojnowski, S. Drew last_name: Chojnowski - first_name: Kathryn V. full_name: Lester, Kathryn V. last_name: Lester - first_name: Steve B. full_name: Howell, Steve B. last_name: Howell citation: ama: Wang L, Gies DR, Peters GJ, et al. The detection and characterization of Be+sdO binaries from HST/STIS FUV spectroscopy. The Astronomical Journal. 2021;161(5). doi:10.3847/1538-3881/abf144 apa: Wang, L., Gies, D. R., Peters, G. J., Götberg, Y. L. L., Chojnowski, S. D., Lester, K. V., & Howell, S. B. (2021). The detection and characterization of Be+sdO binaries from HST/STIS FUV spectroscopy. The Astronomical Journal. American Astronomical Society. https://doi.org/10.3847/1538-3881/abf144 chicago: Wang, Luqian, Douglas R. Gies, Geraldine J. Peters, Ylva Louise Linsdotter Götberg, S. Drew Chojnowski, Kathryn V. Lester, and Steve B. Howell. “The Detection and Characterization of Be+sdO Binaries from HST/STIS FUV Spectroscopy.” The Astronomical Journal. American Astronomical Society, 2021. https://doi.org/10.3847/1538-3881/abf144. ieee: L. Wang et al., “The detection and characterization of Be+sdO binaries from HST/STIS FUV spectroscopy,” The Astronomical Journal, vol. 161, no. 5. American Astronomical Society, 2021. ista: Wang L, Gies DR, Peters GJ, Götberg YLL, Chojnowski SD, Lester KV, Howell SB. 2021. The detection and characterization of Be+sdO binaries from HST/STIS FUV spectroscopy. The Astronomical Journal. 161(5), 248. mla: Wang, Luqian, et al. “The Detection and Characterization of Be+sdO Binaries from HST/STIS FUV Spectroscopy.” The Astronomical Journal, vol. 161, no. 5, 248, American Astronomical Society, 2021, doi:10.3847/1538-3881/abf144. short: L. Wang, D.R. Gies, G.J. Peters, Y.L.L. Götberg, S.D. Chojnowski, K.V. Lester, S.B. Howell, The Astronomical Journal 161 (2021). date_created: 2023-08-03T10:11:57Z date_published: 2021-05-04T00:00:00Z date_updated: 2023-08-21T11:35:50Z day: '04' doi: 10.3847/1538-3881/abf144 extern: '1' external_id: arxiv: - '2103.13642' intvolume: ' 161' issue: '5' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2103.13642 month: '05' oa: 1 oa_version: Preprint publication: The Astronomical Journal publication_identifier: eissn: - 1538-3881 issn: - 0004-6256 publication_status: published publisher: American Astronomical Society quality_controlled: '1' scopus_import: '1' status: public title: The detection and characterization of Be+sdO binaries from HST/STIS FUV spectroscopy type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 161 year: '2021' ... --- _id: '13995' abstract: - lang: eng text: Shape resonances play a central role in many areas of science, but the real-time measurement of the associated many-body dynamics remains challenging. Here, we present measurements of recoil frame angle-resolved photoionization delays in the vicinity of shape resonances of CF4. This technique provides insights into the spatiotemporal photoionization dynamics of molecular shape resonances. We find delays of up to ∼600 as in the ionization out of the highest occupied molecular orbital (HOMO) with a strong dependence on the emission direction and a pronounced asymmetry along the dissociation axis. Comparison with quantum-scattering calculations traces the asymmetries to the interference of a small subset of partial waves at low kinetic energies and, additionally, to the interference of two overlapping shape resonances in the HOMO-1 channel. Our experimental and theoretical results establish a broadly applicable approach to space- and time-resolved photoionization dynamics in the molecular frame. article_number: abj8121 article_processing_charge: No article_type: original author: - first_name: Saijoscha full_name: Heck, Saijoscha last_name: Heck - first_name: Denitsa Rangelova full_name: Baykusheva, Denitsa Rangelova id: 71b4d059-2a03-11ee-914d-dfa3beed6530 last_name: Baykusheva - first_name: Meng full_name: Han, Meng last_name: Han - first_name: Jia-Bao full_name: Ji, Jia-Bao last_name: Ji - first_name: Conaill full_name: Perry, Conaill last_name: Perry - first_name: Xiaochun full_name: Gong, Xiaochun last_name: Gong - first_name: Hans Jakob full_name: Wörner, Hans Jakob last_name: Wörner citation: ama: Heck S, Baykusheva DR, Han M, et al. Attosecond interferometry of shape resonances in the recoil frame of CF4. Science Advances. 2021;7(49). doi:10.1126/sciadv.abj8121 apa: Heck, S., Baykusheva, D. R., Han, M., Ji, J.-B., Perry, C., Gong, X., & Wörner, H. J. (2021). Attosecond interferometry of shape resonances in the recoil frame of CF4. Science Advances. American Association for the Advancement of Science. https://doi.org/10.1126/sciadv.abj8121 chicago: Heck, Saijoscha, Denitsa Rangelova Baykusheva, Meng Han, Jia-Bao Ji, Conaill Perry, Xiaochun Gong, and Hans Jakob Wörner. “Attosecond Interferometry of Shape Resonances in the Recoil Frame of CF4.” Science Advances. American Association for the Advancement of Science, 2021. https://doi.org/10.1126/sciadv.abj8121. ieee: S. Heck et al., “Attosecond interferometry of shape resonances in the recoil frame of CF4,” Science Advances, vol. 7, no. 49. American Association for the Advancement of Science, 2021. ista: Heck S, Baykusheva DR, Han M, Ji J-B, Perry C, Gong X, Wörner HJ. 2021. Attosecond interferometry of shape resonances in the recoil frame of CF4. Science Advances. 7(49), abj8121. mla: Heck, Saijoscha, et al. “Attosecond Interferometry of Shape Resonances in the Recoil Frame of CF4.” Science Advances, vol. 7, no. 49, abj8121, American Association for the Advancement of Science, 2021, doi:10.1126/sciadv.abj8121. short: S. Heck, D.R. Baykusheva, M. Han, J.-B. Ji, C. Perry, X. Gong, H.J. Wörner, Science Advances 7 (2021). date_created: 2023-08-09T13:09:02Z date_published: 2021-12-03T00:00:00Z date_updated: 2024-10-14T12:23:37Z day: '03' doi: 10.1126/sciadv.abj8121 extern: '1' external_id: pmid: - '34860540' intvolume: ' 7' issue: '49' keyword: - Multidisciplinary language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1126/sciadv.abj8121 month: '12' oa: 1 oa_version: Published Version pmid: 1 publication: Science Advances publication_identifier: eissn: - 2375-2548 publication_status: published publisher: American Association for the Advancement of Science quality_controlled: '1' scopus_import: '1' status: public title: Attosecond interferometry of shape resonances in the recoil frame of CF4 type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 7 year: '2021' ... --- _id: '13996' abstract: - lang: eng text: We report the observation of an anomalous nonlinear optical response of the prototypical three-dimensional topological insulator bismuth selenide through the process of high-order harmonic generation. We find that the generation efficiency increases as the laser polarization is changed from linear to elliptical, and it becomes maximum for circular polarization. With the aid of a microscopic theory and a detailed analysis of the measured spectra, we reveal that such anomalous enhancement encodes the characteristic topology of the band structure that originates from the interplay of strong spin–orbit coupling and time-reversal symmetry protection. The implications are in ultrafast probing of topological phase transitions, light-field driven dissipationless electronics, and quantum computation. article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Denitsa Rangelova full_name: Baykusheva, Denitsa Rangelova id: 71b4d059-2a03-11ee-914d-dfa3beed6530 last_name: Baykusheva - first_name: Alexis full_name: Chacón, Alexis last_name: Chacón - first_name: Jian full_name: Lu, Jian last_name: Lu - first_name: Trevor P. full_name: Bailey, Trevor P. last_name: Bailey - first_name: Jonathan A. full_name: Sobota, Jonathan A. last_name: Sobota - first_name: Hadas full_name: Soifer, Hadas last_name: Soifer - first_name: Patrick S. full_name: Kirchmann, Patrick S. last_name: Kirchmann - first_name: Costel full_name: Rotundu, Costel last_name: Rotundu - first_name: Ctirad full_name: Uher, Ctirad last_name: Uher - first_name: Tony F. full_name: Heinz, Tony F. last_name: Heinz - first_name: David A. full_name: Reis, David A. last_name: Reis - first_name: Shambhu full_name: Ghimire, Shambhu last_name: Ghimire citation: ama: Baykusheva DR, Chacón A, Lu J, et al. All-optical probe of three-dimensional topological insulators based on high-harmonic generation by circularly polarized laser fields. Nano Letters. 2021;21(21):8970-8978. doi:10.1021/acs.nanolett.1c02145 apa: Baykusheva, D. R., Chacón, A., Lu, J., Bailey, T. P., Sobota, J. A., Soifer, H., … Ghimire, S. (2021). All-optical probe of three-dimensional topological insulators based on high-harmonic generation by circularly polarized laser fields. Nano Letters. American Chemical Society. https://doi.org/10.1021/acs.nanolett.1c02145 chicago: Baykusheva, Denitsa Rangelova, Alexis Chacón, Jian Lu, Trevor P. Bailey, Jonathan A. Sobota, Hadas Soifer, Patrick S. Kirchmann, et al. “All-Optical Probe of Three-Dimensional Topological Insulators Based on High-Harmonic Generation by Circularly Polarized Laser Fields.” Nano Letters. American Chemical Society, 2021. https://doi.org/10.1021/acs.nanolett.1c02145. ieee: D. R. Baykusheva et al., “All-optical probe of three-dimensional topological insulators based on high-harmonic generation by circularly polarized laser fields,” Nano Letters, vol. 21, no. 21. American Chemical Society, pp. 8970–8978, 2021. ista: Baykusheva DR, Chacón A, Lu J, Bailey TP, Sobota JA, Soifer H, Kirchmann PS, Rotundu C, Uher C, Heinz TF, Reis DA, Ghimire S. 2021. All-optical probe of three-dimensional topological insulators based on high-harmonic generation by circularly polarized laser fields. Nano Letters. 21(21), 8970–8978. mla: Baykusheva, Denitsa Rangelova, et al. “All-Optical Probe of Three-Dimensional Topological Insulators Based on High-Harmonic Generation by Circularly Polarized Laser Fields.” Nano Letters, vol. 21, no. 21, American Chemical Society, 2021, pp. 8970–78, doi:10.1021/acs.nanolett.1c02145. short: D.R. Baykusheva, A. Chacón, J. Lu, T.P. Bailey, J.A. Sobota, H. Soifer, P.S. Kirchmann, C. Rotundu, C. Uher, T.F. Heinz, D.A. Reis, S. Ghimire, Nano Letters 21 (2021) 8970–8978. date_created: 2023-08-09T13:09:15Z date_published: 2021-10-22T00:00:00Z date_updated: 2024-10-14T12:26:13Z day: '22' doi: 10.1021/acs.nanolett.1c02145 extern: '1' external_id: arxiv: - '2109.15291' pmid: - '34676752' intvolume: ' 21' issue: '21' keyword: - Mechanical Engineering - Condensed Matter Physics - General Materials Science - General Chemistry - Bioengineering language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1021/acs.nanolett.1c02145 month: '10' oa: 1 oa_version: Published Version page: 8970-8978 pmid: 1 publication: Nano Letters publication_identifier: eissn: - 1530-6992 issn: - 1530-6984 publication_status: published publisher: American Chemical Society quality_controlled: '1' scopus_import: '1' status: public title: All-optical probe of three-dimensional topological insulators based on high-harmonic generation by circularly polarized laser fields type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 21 year: '2021' ... --- _id: '13997' abstract: - lang: eng text: We investigate theoretically the strong-field regime of light-matter interactions in the topological-insulator class of quantum materials. In particular, we focus on the process of nonperturbative high-order harmonic generation from the paradigmatic three-dimensional topological insulator bismuth selenide (Bi2Se3) subjected to intense midinfrared laser fields. We analyze the contributions from the spin-orbit-coupled bulk states and the topological surface bands separately and reveal a major difference in how their harmonic yields depend on the ellipticity of the laser field. Bulk harmonics show a monotonic decrease in their yield as the ellipticity increases, in a manner reminiscent of high harmonic generation in gaseous media. However, the surface contribution exhibits a highly nontrivial dependence, culminating with a maximum for circularly polarized fields. We attribute the observed anomalous behavior to (i) the enhanced amplitude and the circular pattern of the interband dipole and the Berry connections in the vicinity of the Dirac point and (ii) the influence of the higher-order, hexagonal warping terms in the Hamiltonian, which are responsible for the hexagonal deformation of the energy surface at higher momenta. The latter are associated directly with spin-orbit-coupling parameters. Our results thus establish the sensitivity of strong-field-driven high harmonic emission to the topology of the band structure as well as to the manifestations of spin-orbit interaction. article_number: '023101' article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Denitsa Rangelova full_name: Baykusheva, Denitsa Rangelova id: 71b4d059-2a03-11ee-914d-dfa3beed6530 last_name: Baykusheva - first_name: Alexis full_name: Chacón, Alexis last_name: Chacón - first_name: Dasol full_name: Kim, Dasol last_name: Kim - first_name: Dong Eon full_name: Kim, Dong Eon last_name: Kim - first_name: David A. full_name: Reis, David A. last_name: Reis - first_name: Shambhu full_name: Ghimire, Shambhu last_name: Ghimire citation: ama: Baykusheva DR, Chacón A, Kim D, Kim DE, Reis DA, Ghimire S. Strong-field physics in three-dimensional topological insulators. Physical Review A. 2021;103(2). doi:10.1103/physreva.103.023101 apa: Baykusheva, D. R., Chacón, A., Kim, D., Kim, D. E., Reis, D. A., & Ghimire, S. (2021). Strong-field physics in three-dimensional topological insulators. Physical Review A. American Physical Society. https://doi.org/10.1103/physreva.103.023101 chicago: Baykusheva, Denitsa Rangelova, Alexis Chacón, Dasol Kim, Dong Eon Kim, David A. Reis, and Shambhu Ghimire. “Strong-Field Physics in Three-Dimensional Topological Insulators.” Physical Review A. American Physical Society, 2021. https://doi.org/10.1103/physreva.103.023101. ieee: D. R. Baykusheva, A. Chacón, D. Kim, D. E. Kim, D. A. Reis, and S. Ghimire, “Strong-field physics in three-dimensional topological insulators,” Physical Review A, vol. 103, no. 2. American Physical Society, 2021. ista: Baykusheva DR, Chacón A, Kim D, Kim DE, Reis DA, Ghimire S. 2021. Strong-field physics in three-dimensional topological insulators. Physical Review A. 103(2), 023101. mla: Baykusheva, Denitsa Rangelova, et al. “Strong-Field Physics in Three-Dimensional Topological Insulators.” Physical Review A, vol. 103, no. 2, 023101, American Physical Society, 2021, doi:10.1103/physreva.103.023101. short: D.R. Baykusheva, A. Chacón, D. Kim, D.E. Kim, D.A. Reis, S. Ghimire, Physical Review A 103 (2021). date_created: 2023-08-09T13:09:26Z date_published: 2021-02-01T00:00:00Z date_updated: 2024-10-14T12:26:26Z day: '01' doi: 10.1103/physreva.103.023101 extern: '1' external_id: arxiv: - '2008.01265' intvolume: ' 103' issue: '2' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2008.01265 month: '02' oa: 1 oa_version: Preprint publication: Physical Review A publication_identifier: eissn: - 2469-9934 issn: - 2469-9926 publication_status: published publisher: American Physical Society quality_controlled: '1' scopus_import: '1' status: public title: Strong-field physics in three-dimensional topological insulators type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 103 year: '2021' ... --- _id: '14097' abstract: - lang: eng text: UVEX is a proposed medium class Explorer mission designed to provide crucial missing capabilities that will address objectives central to a broad range of modern astrophysics. The UVEX design has two co-aligned wide-field imagers operating in the FUV and NUV and a powerful broadband medium resolution spectrometer. In its two-year baseline mission, UVEX will perform a multi-cadence synoptic all-sky survey 50/100 times deeper than GALEX in the NUV/FUV, cadenced surveys of the Large and Small Magellanic Clouds, rapid target of opportunity followup, as well as spectroscopic followup of samples of stars and galaxies. The science program is built around three pillars. First, UVEX will explore the low-mass, low-metallicity galaxy frontier through imaging and spectroscopic surveys that will probe key aspects of the evolution of galaxies by understanding how star formation and stellar evolution at low metallicities affect the growth and evolution of low-metallicity, low-mass galaxies in the local universe. Such galaxies contain half the mass in the local universe, and are analogs for the first galaxies, but observed at distances that make them accessible to detailed study. Second, UVEX will explore the dynamic universe through time-domain surveys and prompt spectroscopic followup capability will probe the environments, energetics, and emission processes in the early aftermaths of gravitational wave-discovered compact object mergers, discover hot, fast UV transients, and diagnose the early stages of stellar explosions. Finally, UVEX will become a key community resource by leaving a large all-sky legacy data set, enabling a wide range of scientific studies and filling a gap in the new generation of wide-field, sensitive optical and infrared surveys provided by the Rubin, Euclid, and Roman observatories. This paper discusses the scientific potential of UVEX, and the broad scientific program. article_number: '2111.15608' article_processing_charge: No arxiv: 1 author: - first_name: S. R. full_name: Kulkarni, S. R. last_name: Kulkarni - first_name: Fiona A. full_name: Harrison, Fiona A. last_name: Harrison - first_name: Brian W. full_name: Grefenstette, Brian W. last_name: Grefenstette - first_name: Hannah P. full_name: Earnshaw, Hannah P. last_name: Earnshaw - first_name: Igor full_name: Andreoni, Igor last_name: Andreoni - first_name: Danielle A. full_name: Berg, Danielle A. last_name: Berg - first_name: Joshua S. full_name: Bloom, Joshua S. last_name: Bloom - first_name: S. Bradley full_name: Cenko, S. Bradley last_name: Cenko - first_name: Ryan full_name: Chornock, Ryan last_name: Chornock - first_name: Jessie L. full_name: Christiansen, Jessie L. last_name: Christiansen - first_name: Michael W. full_name: Coughlin, Michael W. last_name: Coughlin - first_name: Alexander Wuollet full_name: Criswell, Alexander Wuollet last_name: Criswell - first_name: Behnam full_name: Darvish, Behnam last_name: Darvish - first_name: Kaustav K. full_name: Das, Kaustav K. last_name: Das - first_name: Kishalay full_name: De, Kishalay last_name: De - first_name: Luc full_name: Dessart, Luc last_name: Dessart - first_name: Don full_name: Dixon, Don last_name: Dixon - first_name: Bas full_name: Dorsman, Bas last_name: Dorsman - first_name: Kareem El-Badry full_name: Kareem El-Badry, Kareem El-Badry last_name: Kareem El-Badry - first_name: Christopher full_name: Evans, Christopher last_name: Evans - first_name: K. E. Saavik full_name: Ford, K. E. Saavik last_name: Ford - first_name: Christoffer full_name: Fremling, Christoffer last_name: Fremling - first_name: Boris T. full_name: Gansicke, Boris T. last_name: Gansicke - first_name: Suvi full_name: Gezari, Suvi last_name: Gezari - first_name: Ylva Louise Linsdotter full_name: Götberg, Ylva Louise Linsdotter id: d0648d0c-0f64-11ee-a2e0-dd0faa2e4f7d last_name: Götberg orcid: 0000-0002-6960-6911 - first_name: Gregory M. full_name: Green, Gregory M. last_name: Green - first_name: Matthew J. full_name: Graham, Matthew J. last_name: Graham - first_name: Marianne full_name: Heida, Marianne last_name: Heida - first_name: Anna Y. Q. full_name: Ho, Anna Y. Q. last_name: Ho - first_name: Amruta D. full_name: Jaodand, Amruta D. last_name: Jaodand - first_name: Christopher M. Johns-Krull full_name: Christopher M. Johns-Krull, Christopher M. Johns-Krull last_name: Christopher M. Johns-Krull - first_name: Mansi M. full_name: Kasliwal, Mansi M. last_name: Kasliwal - first_name: Margaret full_name: Lazzarini, Margaret last_name: Lazzarini - first_name: Wenbin full_name: Lu, Wenbin last_name: Lu - first_name: Raffaella full_name: Margutti, Raffaella last_name: Margutti - first_name: D. Christopher full_name: Martin, D. Christopher last_name: Martin - first_name: Daniel Charles full_name: Masters, Daniel Charles last_name: Masters - first_name: Barry full_name: McKernan, Barry last_name: McKernan - first_name: Yael full_name: Naze, Yael last_name: Naze - first_name: Samaya M. full_name: Nissanke, Samaya M. last_name: Nissanke - first_name: B. full_name: Parazin, B. last_name: Parazin - first_name: Daniel A. full_name: Perley, Daniel A. last_name: Perley - first_name: E. Sterl full_name: Phinney, E. Sterl last_name: Phinney - first_name: Anthony L. full_name: Piro, Anthony L. last_name: Piro - first_name: G. full_name: Raaijmakers, G. last_name: Raaijmakers - first_name: Gregor full_name: Rauw, Gregor last_name: Rauw - first_name: Antonio C. full_name: Rodriguez, Antonio C. last_name: Rodriguez - first_name: Hugues full_name: Sana, Hugues last_name: Sana - first_name: Peter full_name: Senchyna, Peter last_name: Senchyna - first_name: Leo P. full_name: Singer, Leo P. last_name: Singer - first_name: Jessica J. full_name: Spake, Jessica J. last_name: Spake - first_name: Keivan G. full_name: Stassun, Keivan G. last_name: Stassun - first_name: Daniel full_name: Stern, Daniel last_name: Stern - first_name: Harry I. full_name: Teplitz, Harry I. last_name: Teplitz - first_name: Daniel R. full_name: Weisz, Daniel R. last_name: Weisz - first_name: Yuhan full_name: Yao, Yuhan last_name: Yao citation: ama: Kulkarni SR, Harrison FA, Grefenstette BW, et al. Science with the ultraviolet explorer (UVEX). arXiv. doi:10.48550/arXiv.2111.15608 apa: Kulkarni, S. R., Harrison, F. A., Grefenstette, B. W., Earnshaw, H. P., Andreoni, I., Berg, D. A., … Yao, Y. (n.d.). Science with the ultraviolet explorer (UVEX). arXiv. https://doi.org/10.48550/arXiv.2111.15608 chicago: Kulkarni, S. R., Fiona A. Harrison, Brian W. Grefenstette, Hannah P. Earnshaw, Igor Andreoni, Danielle A. Berg, Joshua S. Bloom, et al. “Science with the Ultraviolet Explorer (UVEX).” ArXiv, n.d. https://doi.org/10.48550/arXiv.2111.15608. ieee: S. R. Kulkarni et al., “Science with the ultraviolet explorer (UVEX),” arXiv. . ista: Kulkarni SR, Harrison FA, Grefenstette BW, Earnshaw HP, Andreoni I, Berg DA, Bloom JS, Cenko SB, Chornock R, Christiansen JL, Coughlin MW, Criswell AW, Darvish B, Das KK, De K, Dessart L, Dixon D, Dorsman B, Kareem El-Badry KE-B, Evans C, Ford KES, Fremling C, Gansicke BT, Gezari S, Götberg YLL, Green GM, Graham MJ, Heida M, Ho AYQ, Jaodand AD, Christopher M. Johns-Krull CMJ-K, Kasliwal MM, Lazzarini M, Lu W, Margutti R, Martin DC, Masters DC, McKernan B, Naze Y, Nissanke SM, Parazin B, Perley DA, Phinney ES, Piro AL, Raaijmakers G, Rauw G, Rodriguez AC, Sana H, Senchyna P, Singer LP, Spake JJ, Stassun KG, Stern D, Teplitz HI, Weisz DR, Yao Y. Science with the ultraviolet explorer (UVEX). arXiv, 2111.15608. mla: Kulkarni, S. R., et al. “Science with the Ultraviolet Explorer (UVEX).” ArXiv, 2111.15608, doi:10.48550/arXiv.2111.15608. short: S.R. Kulkarni, F.A. Harrison, B.W. Grefenstette, H.P. Earnshaw, I. Andreoni, D.A. Berg, J.S. Bloom, S.B. Cenko, R. Chornock, J.L. Christiansen, M.W. Coughlin, A.W. Criswell, B. Darvish, K.K. Das, K. De, L. Dessart, D. Dixon, B. Dorsman, K.E.-B. Kareem El-Badry, C. Evans, K.E.S. Ford, C. Fremling, B.T. Gansicke, S. Gezari, Y.L.L. Götberg, G.M. Green, M.J. Graham, M. Heida, A.Y.Q. Ho, A.D. Jaodand, C.M.J.-K. Christopher M. Johns-Krull, M.M. Kasliwal, M. Lazzarini, W. Lu, R. Margutti, D.C. Martin, D.C. Masters, B. McKernan, Y. Naze, S.M. Nissanke, B. Parazin, D.A. Perley, E.S. Phinney, A.L. Piro, G. Raaijmakers, G. Rauw, A.C. Rodriguez, H. Sana, P. Senchyna, L.P. Singer, J.J. Spake, K.G. Stassun, D. Stern, H.I. Teplitz, D.R. Weisz, Y. Yao, ArXiv (n.d.). date_created: 2023-08-21T10:11:00Z date_published: 2021-11-30T00:00:00Z date_updated: 2024-07-16T12:30:12Z day: '30' doi: 10.48550/arXiv.2111.15608 extern: '1' external_id: arxiv: - '2111.15608' language: - iso: eng main_file_link: - open_access: '1' url: ' https://doi.org/10.48550/arXiv.2111.15608' month: '11' oa: 1 oa_version: Preprint publication: arXiv publication_status: submitted related_material: link: - description: News on ISTA website relation: press_release url: https://ista.ac.at/en/news/deep-mapping-the-night-sky-for-hot-stars/ status: public title: Science with the ultraviolet explorer (UVEX) type: preprint user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2021' ... --- _id: '14117' abstract: - lang: eng text: 'The two fields of machine learning and graphical causality arose and are developed separately. However, there is, now, cross-pollination and increasing interest in both fields to benefit from the advances of the other. In this article, we review fundamental concepts of causal inference and relate them to crucial open problems of machine learning, including transfer and generalization, thereby assaying how causality can contribute to modern machine learning research. This also applies in the opposite direction: we note that most work in causality starts from the premise that the causal variables are given. A central problem for AI and causality is, thus, causal representation learning, that is, the discovery of high-level causal variables from low-level observations. Finally, we delineate some implications of causality for machine learning and propose key research areas at the intersection of both communities.' article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Bernhard full_name: Scholkopf, Bernhard last_name: Scholkopf - first_name: Francesco full_name: Locatello, Francesco id: 26cfd52f-2483-11ee-8040-88983bcc06d4 last_name: Locatello orcid: 0000-0002-4850-0683 - first_name: Stefan full_name: Bauer, Stefan last_name: Bauer - first_name: Nan Rosemary full_name: Ke, Nan Rosemary last_name: Ke - first_name: Nal full_name: Kalchbrenner, Nal last_name: Kalchbrenner - first_name: Anirudh full_name: Goyal, Anirudh last_name: Goyal - first_name: Yoshua full_name: Bengio, Yoshua last_name: Bengio citation: ama: Scholkopf B, Locatello F, Bauer S, et al. Toward causal representation learning. Proceedings of the IEEE. 2021;109(5):612-634. doi:10.1109/jproc.2021.3058954 apa: Scholkopf, B., Locatello, F., Bauer, S., Ke, N. R., Kalchbrenner, N., Goyal, A., & Bengio, Y. (2021). Toward causal representation learning. Proceedings of the IEEE. Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/jproc.2021.3058954 chicago: Scholkopf, Bernhard, Francesco Locatello, Stefan Bauer, Nan Rosemary Ke, Nal Kalchbrenner, Anirudh Goyal, and Yoshua Bengio. “Toward Causal Representation Learning.” Proceedings of the IEEE. Institute of Electrical and Electronics Engineers, 2021. https://doi.org/10.1109/jproc.2021.3058954. ieee: B. Scholkopf et al., “Toward causal representation learning,” Proceedings of the IEEE, vol. 109, no. 5. Institute of Electrical and Electronics Engineers, pp. 612–634, 2021. ista: Scholkopf B, Locatello F, Bauer S, Ke NR, Kalchbrenner N, Goyal A, Bengio Y. 2021. Toward causal representation learning. Proceedings of the IEEE. 109(5), 612–634. mla: Scholkopf, Bernhard, et al. “Toward Causal Representation Learning.” Proceedings of the IEEE, vol. 109, no. 5, Institute of Electrical and Electronics Engineers, 2021, pp. 612–34, doi:10.1109/jproc.2021.3058954. short: B. Scholkopf, F. Locatello, S. Bauer, N.R. Ke, N. Kalchbrenner, A. Goyal, Y. Bengio, Proceedings of the IEEE 109 (2021) 612–634. date_created: 2023-08-21T12:19:30Z date_published: 2021-05-01T00:00:00Z date_updated: 2023-09-11T11:43:35Z day: '01' department: - _id: FrLo doi: 10.1109/jproc.2021.3058954 extern: '1' external_id: arxiv: - '2102.11107' intvolume: ' 109' issue: '5' keyword: - Electrical and Electronic Engineering language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1109/JPROC.2021.3058954 month: '05' oa: 1 oa_version: Published Version page: 612-634 publication: Proceedings of the IEEE publication_identifier: eissn: - 1558-2256 issn: - 0018-9219 publication_status: published publisher: Institute of Electrical and Electronics Engineers quality_controlled: '1' scopus_import: '1' status: public title: Toward causal representation learning type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 109 year: '2021' ... --- _id: '14176' abstract: - lang: eng text: "Intensive care units (ICU) are increasingly looking towards machine learning for methods to provide online monitoring of critically ill patients. In machine learning, online monitoring is often formulated as a supervised learning problem. Recently, contrastive learning approaches have demonstrated promising improvements over competitive supervised benchmarks. These methods rely on well-understood data augmentation techniques developed for image data which do not apply to online monitoring. In this work, we overcome this limitation by\r\nsupplementing time-series data augmentation techniques with a novel contrastive\r\nlearning objective which we call neighborhood contrastive learning (NCL). Our objective explicitly groups together contiguous time segments from each patient while maintaining state-specific information. Our experiments demonstrate a marked improvement over existing work applying contrastive methods to medical time-series." alternative_title: - PMLR article_processing_charge: No arxiv: 1 author: - first_name: Hugo full_name: Yèche, Hugo last_name: Yèche - first_name: Gideon full_name: Dresdner, Gideon last_name: Dresdner - first_name: Francesco full_name: Locatello, Francesco id: 26cfd52f-2483-11ee-8040-88983bcc06d4 last_name: Locatello orcid: 0000-0002-4850-0683 - first_name: Matthias full_name: Hüser, Matthias last_name: Hüser - first_name: Gunnar full_name: Rätsch, Gunnar last_name: Rätsch citation: ama: 'Yèche H, Dresdner G, Locatello F, Hüser M, Rätsch G. Neighborhood contrastive learning applied to online patient monitoring. In: Proceedings of 38th International Conference on Machine Learning. Vol 139. ML Research Press; 2021:11964-11974.' apa: 'Yèche, H., Dresdner, G., Locatello, F., Hüser, M., & Rätsch, G. (2021). Neighborhood contrastive learning applied to online patient monitoring. In Proceedings of 38th International Conference on Machine Learning (Vol. 139, pp. 11964–11974). Virtual: ML Research Press.' chicago: Yèche, Hugo, Gideon Dresdner, Francesco Locatello, Matthias Hüser, and Gunnar Rätsch. “Neighborhood Contrastive Learning Applied to Online Patient Monitoring.” In Proceedings of 38th International Conference on Machine Learning, 139:11964–74. ML Research Press, 2021. ieee: H. Yèche, G. Dresdner, F. Locatello, M. Hüser, and G. Rätsch, “Neighborhood contrastive learning applied to online patient monitoring,” in Proceedings of 38th International Conference on Machine Learning, Virtual, 2021, vol. 139, pp. 11964–11974. ista: Yèche H, Dresdner G, Locatello F, Hüser M, Rätsch G. 2021. Neighborhood contrastive learning applied to online patient monitoring. Proceedings of 38th International Conference on Machine Learning. International Conference on Machine Learning, PMLR, vol. 139, 11964–11974. mla: Yèche, Hugo, et al. “Neighborhood Contrastive Learning Applied to Online Patient Monitoring.” Proceedings of 38th International Conference on Machine Learning, vol. 139, ML Research Press, 2021, pp. 11964–74. short: H. Yèche, G. Dresdner, F. Locatello, M. Hüser, G. Rätsch, in:, Proceedings of 38th International Conference on Machine Learning, ML Research Press, 2021, pp. 11964–11974. conference: end_date: 2021-07-24 location: Virtual name: International Conference on Machine Learning start_date: 2021-07-18 date_created: 2023-08-22T14:03:04Z date_published: 2021-08-01T00:00:00Z date_updated: 2023-09-11T10:16:55Z day: '01' department: - _id: FrLo extern: '1' external_id: arxiv: - '2106.05142' intvolume: ' 139' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2106.05142 month: '08' oa: 1 oa_version: Preprint page: 11964-11974 publication: Proceedings of 38th International Conference on Machine Learning publication_status: published publisher: ML Research Press quality_controlled: '1' scopus_import: '1' status: public title: Neighborhood contrastive learning applied to online patient monitoring type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 139 year: '2021' ... --- _id: '14177' abstract: - lang: eng text: "The focus of disentanglement approaches has been on identifying independent factors of variation in data. However, the causal variables underlying real-world observations are often not statistically independent. In this work, we bridge the gap to real-world scenarios by analyzing the behavior of the most prominent disentanglement approaches on correlated data in a large-scale empirical study (including 4260 models). We show and quantify that systematically induced correlations in the dataset are being learned and reflected in the latent representations, which has implications for downstream applications of disentanglement such as fairness. We also demonstrate how to resolve these latent correlations, either using weak supervision during\r\ntraining or by post-hoc correcting a pre-trained model with a small number of labels." alternative_title: - PMLR article_processing_charge: No arxiv: 1 author: - first_name: Frederik full_name: Träuble, Frederik last_name: Träuble - first_name: Elliot full_name: Creager, Elliot last_name: Creager - first_name: Niki full_name: Kilbertus, Niki last_name: Kilbertus - first_name: Francesco full_name: Locatello, Francesco id: 26cfd52f-2483-11ee-8040-88983bcc06d4 last_name: Locatello orcid: 0000-0002-4850-0683 - first_name: Andrea full_name: Dittadi, Andrea last_name: Dittadi - first_name: Anirudh full_name: Goyal, Anirudh last_name: Goyal - first_name: Bernhard full_name: Schölkopf, Bernhard last_name: Schölkopf - first_name: Stefan full_name: Bauer, Stefan last_name: Bauer citation: ama: 'Träuble F, Creager E, Kilbertus N, et al. On disentangled representations learned from correlated data. In: Proceedings of the 38th International Conference on Machine Learning. Vol 139. ML Research Press; 2021:10401-10412.' apa: 'Träuble, F., Creager, E., Kilbertus, N., Locatello, F., Dittadi, A., Goyal, A., … Bauer, S. (2021). On disentangled representations learned from correlated data. In Proceedings of the 38th International Conference on Machine Learning (Vol. 139, pp. 10401–10412). Virtual: ML Research Press.' chicago: Träuble, Frederik, Elliot Creager, Niki Kilbertus, Francesco Locatello, Andrea Dittadi, Anirudh Goyal, Bernhard Schölkopf, and Stefan Bauer. “On Disentangled Representations Learned from Correlated Data.” In Proceedings of the 38th International Conference on Machine Learning, 139:10401–12. ML Research Press, 2021. ieee: F. Träuble et al., “On disentangled representations learned from correlated data,” in Proceedings of the 38th International Conference on Machine Learning, Virtual, 2021, vol. 139, pp. 10401–10412. ista: 'Träuble F, Creager E, Kilbertus N, Locatello F, Dittadi A, Goyal A, Schölkopf B, Bauer S. 2021. On disentangled representations learned from correlated data. Proceedings of the 38th International Conference on Machine Learning. ICML: International Conference on Machine Learning, PMLR, vol. 139, 10401–10412.' mla: Träuble, Frederik, et al. “On Disentangled Representations Learned from Correlated Data.” Proceedings of the 38th International Conference on Machine Learning, vol. 139, ML Research Press, 2021, pp. 10401–12. short: F. Träuble, E. Creager, N. Kilbertus, F. Locatello, A. Dittadi, A. Goyal, B. Schölkopf, S. Bauer, in:, Proceedings of the 38th International Conference on Machine Learning, ML Research Press, 2021, pp. 10401–10412. conference: end_date: 2021-07-24 location: Virtual name: 'ICML: International Conference on Machine Learning' start_date: 2021-07-18 date_created: 2023-08-22T14:03:47Z date_published: 2021-08-01T00:00:00Z date_updated: 2023-09-11T10:18:48Z day: '01' department: - _id: FrLo extern: '1' external_id: arxiv: - '2006.07886' intvolume: ' 139' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2006.07886 month: '08' oa: 1 oa_version: Published Version page: 10401-10412 publication: Proceedings of the 38th International Conference on Machine Learning publication_status: published publisher: ML Research Press quality_controlled: '1' scopus_import: '1' status: public title: On disentangled representations learned from correlated data type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 139 year: '2021' ... --- _id: '14178' abstract: - lang: eng text: Learning meaningful representations that disentangle the underlying structure of the data generating process is considered to be of key importance in machine learning. While disentangled representations were found to be useful for diverse tasks such as abstract reasoning and fair classification, their scalability and real-world impact remain questionable. We introduce a new high-resolution dataset with 1M simulated images and over 1,800 annotated real-world images of the same setup. In contrast to previous work, this new dataset exhibits correlations, a complex underlying structure, and allows to evaluate transfer to unseen simulated and real-world settings where the encoder i) remains in distribution or ii) is out of distribution. We propose new architectures in order to scale disentangled representation learning to realistic high-resolution settings and conduct a large-scale empirical study of disentangled representations on this dataset. We observe that disentanglement is a good predictor for out-of-distribution (OOD) task performance. article_processing_charge: No arxiv: 1 author: - first_name: Andrea full_name: Dittadi, Andrea last_name: Dittadi - first_name: Frederik full_name: Träuble, Frederik last_name: Träuble - first_name: Francesco full_name: Locatello, Francesco id: 26cfd52f-2483-11ee-8040-88983bcc06d4 last_name: Locatello orcid: 0000-0002-4850-0683 - first_name: Manuel full_name: Wüthrich, Manuel last_name: Wüthrich - first_name: Vaibhav full_name: Agrawal, Vaibhav last_name: Agrawal - first_name: Ole full_name: Winther, Ole last_name: Winther - first_name: Stefan full_name: Bauer, Stefan last_name: Bauer - first_name: Bernhard full_name: Schölkopf, Bernhard last_name: Schölkopf citation: ama: 'Dittadi A, Träuble F, Locatello F, et al. On the transfer of disentangled representations in realistic settings. In: The Ninth International Conference on Learning Representations. ; 2021.' apa: Dittadi, A., Träuble, F., Locatello, F., Wüthrich, M., Agrawal, V., Winther, O., … Schölkopf, B. (2021). On the transfer of disentangled representations in realistic settings. In The Ninth International Conference on Learning Representations. Virtual. chicago: Dittadi, Andrea, Frederik Träuble, Francesco Locatello, Manuel Wüthrich, Vaibhav Agrawal, Ole Winther, Stefan Bauer, and Bernhard Schölkopf. “On the Transfer of Disentangled Representations in Realistic Settings.” In The Ninth International Conference on Learning Representations, 2021. ieee: A. Dittadi et al., “On the transfer of disentangled representations in realistic settings,” in The Ninth International Conference on Learning Representations, Virtual, 2021. ista: 'Dittadi A, Träuble F, Locatello F, Wüthrich M, Agrawal V, Winther O, Bauer S, Schölkopf B. 2021. On the transfer of disentangled representations in realistic settings. The Ninth International Conference on Learning Representations. ICLR: International Conference on Learning Representations.' mla: Dittadi, Andrea, et al. “On the Transfer of Disentangled Representations in Realistic Settings.” The Ninth International Conference on Learning Representations, 2021. short: A. Dittadi, F. Träuble, F. Locatello, M. Wüthrich, V. Agrawal, O. Winther, S. Bauer, B. Schölkopf, in:, The Ninth International Conference on Learning Representations, 2021. conference: end_date: 2021-05-07 location: Virtual name: 'ICLR: International Conference on Learning Representations' start_date: 2021-05-03 date_created: 2023-08-22T14:04:16Z date_published: 2021-05-04T00:00:00Z date_updated: 2023-09-11T10:55:30Z day: '04' department: - _id: FrLo extern: '1' external_id: arxiv: - '2010.14407' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2010.14407 month: '05' oa: 1 oa_version: Preprint publication: The Ninth International Conference on Learning Representations publication_status: published quality_controlled: '1' status: public title: On the transfer of disentangled representations in realistic settings type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2021' ... --- _id: '14179' abstract: - lang: eng text: Self-supervised representation learning has shown remarkable success in a number of domains. A common practice is to perform data augmentation via hand-crafted transformations intended to leave the semantics of the data invariant. We seek to understand the empirical success of this approach from a theoretical perspective. We formulate the augmentation process as a latent variable model by postulating a partition of the latent representation into a content component, which is assumed invariant to augmentation, and a style component, which is allowed to change. Unlike prior work on disentanglement and independent component analysis, we allow for both nontrivial statistical and causal dependencies in the latent space. We study the identifiability of the latent representation based on pairs of views of the observations and prove sufficient conditions that allow us to identify the invariant content partition up to an invertible mapping in both generative and discriminative settings. We find numerical simulations with dependent latent variables are consistent with our theory. Lastly, we introduce Causal3DIdent, a dataset of high-dimensional, visually complex images with rich causal dependencies, which we use to study the effect of data augmentations performed in practice. article_processing_charge: No arxiv: 1 author: - first_name: Julius von full_name: Kügelgen, Julius von last_name: Kügelgen - first_name: Yash full_name: Sharma, Yash last_name: Sharma - first_name: Luigi full_name: Gresele, Luigi last_name: Gresele - first_name: Wieland full_name: Brendel, Wieland last_name: Brendel - first_name: Bernhard full_name: Schölkopf, Bernhard last_name: Schölkopf - first_name: Michel full_name: Besserve, Michel last_name: Besserve - first_name: Francesco full_name: Locatello, Francesco id: 26cfd52f-2483-11ee-8040-88983bcc06d4 last_name: Locatello orcid: 0000-0002-4850-0683 citation: ama: 'Kügelgen J von, Sharma Y, Gresele L, et al. Self-supervised learning with data augmentations provably isolates content from style. In: Advances in Neural Information Processing Systems. Vol 34. ; 2021:16451-16467.' apa: Kügelgen, J. von, Sharma, Y., Gresele, L., Brendel, W., Schölkopf, B., Besserve, M., & Locatello, F. (2021). Self-supervised learning with data augmentations provably isolates content from style. In Advances in Neural Information Processing Systems (Vol. 34, pp. 16451–16467). Virtual. chicago: Kügelgen, Julius von, Yash Sharma, Luigi Gresele, Wieland Brendel, Bernhard Schölkopf, Michel Besserve, and Francesco Locatello. “Self-Supervised Learning with Data Augmentations Provably Isolates Content from Style.” In Advances in Neural Information Processing Systems, 34:16451–67, 2021. ieee: J. von Kügelgen et al., “Self-supervised learning with data augmentations provably isolates content from style,” in Advances in Neural Information Processing Systems, Virtual, 2021, vol. 34, pp. 16451–16467. ista: 'Kügelgen J von, Sharma Y, Gresele L, Brendel W, Schölkopf B, Besserve M, Locatello F. 2021. Self-supervised learning with data augmentations provably isolates content from style. Advances in Neural Information Processing Systems. NeurIPS: Neural Information Processing Systems vol. 34, 16451–16467.' mla: Kügelgen, Julius von, et al. “Self-Supervised Learning with Data Augmentations Provably Isolates Content from Style.” Advances in Neural Information Processing Systems, vol. 34, 2021, pp. 16451–67. short: J. von Kügelgen, Y. Sharma, L. Gresele, W. Brendel, B. Schölkopf, M. Besserve, F. Locatello, in:, Advances in Neural Information Processing Systems, 2021, pp. 16451–16467. conference: end_date: 2021-12-10 location: Virtual name: 'NeurIPS: Neural Information Processing Systems' start_date: 2021-12-07 date_created: 2023-08-22T14:04:36Z date_published: 2021-06-08T00:00:00Z date_updated: 2023-09-11T10:33:19Z day: '08' department: - _id: FrLo extern: '1' external_id: arxiv: - '2106.04619' intvolume: ' 34' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2106.04619 month: '06' oa: 1 oa_version: Preprint page: 16451-16467 publication: Advances in Neural Information Processing Systems publication_identifier: isbn: - '9781713845393' publication_status: published quality_controlled: '1' status: public title: Self-supervised learning with data augmentations provably isolates content from style type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 34 year: '2021' ... --- _id: '14180' abstract: - lang: eng text: 'Modern neural network architectures can leverage large amounts of data to generalize well within the training distribution. However, they are less capable of systematic generalization to data drawn from unseen but related distributions, a feat that is hypothesized to require compositional reasoning and reuse of knowledge. In this work, we present Neural Interpreters, an architecture that factorizes inference in a self-attention network as a system of modules, which we call \emph{functions}. Inputs to the model are routed through a sequence of functions in a way that is end-to-end learned. The proposed architecture can flexibly compose computation along width and depth, and lends itself well to capacity extension after training. To demonstrate the versatility of Neural Interpreters, we evaluate it in two distinct settings: image classification and visual abstract reasoning on Raven Progressive Matrices. In the former, we show that Neural Interpreters perform on par with the vision transformer using fewer parameters, while being transferrable to a new task in a sample efficient manner. In the latter, we find that Neural Interpreters are competitive with respect to the state-of-the-art in terms of systematic generalization. ' article_processing_charge: No arxiv: 1 author: - first_name: Nasim full_name: Rahaman, Nasim last_name: Rahaman - first_name: Muhammad Waleed full_name: Gondal, Muhammad Waleed last_name: Gondal - first_name: Shruti full_name: Joshi, Shruti last_name: Joshi - first_name: Peter full_name: Gehler, Peter last_name: Gehler - first_name: Yoshua full_name: Bengio, Yoshua last_name: Bengio - first_name: Francesco full_name: Locatello, Francesco id: 26cfd52f-2483-11ee-8040-88983bcc06d4 last_name: Locatello orcid: 0000-0002-4850-0683 - first_name: Bernhard full_name: Schölkopf, Bernhard last_name: Schölkopf citation: ama: 'Rahaman N, Gondal MW, Joshi S, et al. Dynamic inference with neural interpreters. In: Advances in Neural Information Processing Systems. Vol 34. ; 2021:10985-10998.' apa: Rahaman, N., Gondal, M. W., Joshi, S., Gehler, P., Bengio, Y., Locatello, F., & Schölkopf, B. (2021). Dynamic inference with neural interpreters. In Advances in Neural Information Processing Systems (Vol. 34, pp. 10985–10998). Virtual. chicago: Rahaman, Nasim, Muhammad Waleed Gondal, Shruti Joshi, Peter Gehler, Yoshua Bengio, Francesco Locatello, and Bernhard Schölkopf. “Dynamic Inference with Neural Interpreters.” In Advances in Neural Information Processing Systems, 34:10985–98, 2021. ieee: N. Rahaman et al., “Dynamic inference with neural interpreters,” in Advances in Neural Information Processing Systems, Virtual, 2021, vol. 34, pp. 10985–10998. ista: 'Rahaman N, Gondal MW, Joshi S, Gehler P, Bengio Y, Locatello F, Schölkopf B. 2021. Dynamic inference with neural interpreters. Advances in Neural Information Processing Systems. NeurIPS: Neural Information Processing Systems vol. 34, 10985–10998.' mla: Rahaman, Nasim, et al. “Dynamic Inference with Neural Interpreters.” Advances in Neural Information Processing Systems, vol. 34, 2021, pp. 10985–98. short: N. Rahaman, M.W. Gondal, S. Joshi, P. Gehler, Y. Bengio, F. Locatello, B. Schölkopf, in:, Advances in Neural Information Processing Systems, 2021, pp. 10985–10998. conference: end_date: 2021-12-10 location: Virtual name: 'NeurIPS: Neural Information Processing Systems' start_date: 2021-12-07 date_created: 2023-08-22T14:04:55Z date_published: 2021-10-12T00:00:00Z date_updated: 2024-10-14T12:27:25Z day: '12' department: - _id: FrLo extern: '1' external_id: arxiv: - '2110.06399' intvolume: ' 34' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2110.06399 month: '10' oa: 1 oa_version: Preprint page: 10985-10998 publication: Advances in Neural Information Processing Systems publication_identifier: isbn: - '9781713845393' publication_status: published quality_controlled: '1' status: public title: Dynamic inference with neural interpreters type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 34 year: '2021' ... --- _id: '14181' abstract: - lang: eng text: Variational Inference makes a trade-off between the capacity of the variational family and the tractability of finding an approximate posterior distribution. Instead, Boosting Variational Inference allows practitioners to obtain increasingly good posterior approximations by spending more compute. The main obstacle to widespread adoption of Boosting Variational Inference is the amount of resources necessary to improve over a strong Variational Inference baseline. In our work, we trace this limitation back to the global curvature of the KL-divergence. We characterize how the global curvature impacts time and memory consumption, address the problem with the notion of local curvature, and provide a novel approximate backtracking algorithm for estimating local curvature. We give new theoretical convergence rates for our algorithms and provide experimental validation on synthetic and real-world datasets. article_processing_charge: No arxiv: 1 author: - first_name: Gideon full_name: Dresdner, Gideon last_name: Dresdner - first_name: Saurav full_name: Shekhar, Saurav last_name: Shekhar - first_name: Fabian full_name: Pedregosa, Fabian last_name: Pedregosa - first_name: Francesco full_name: Locatello, Francesco id: 26cfd52f-2483-11ee-8040-88983bcc06d4 last_name: Locatello orcid: 0000-0002-4850-0683 - first_name: Gunnar full_name: Rätsch, Gunnar last_name: Rätsch citation: ama: 'Dresdner G, Shekhar S, Pedregosa F, Locatello F, Rätsch G. Boosting variational inference with locally adaptive step-sizes. In: Proceedings of the Thirtieth International Joint Conference on Artificial Intelligence. International Joint Conferences on Artificial Intelligence; 2021:2337-2343. doi:10.24963/ijcai.2021/322' apa: 'Dresdner, G., Shekhar, S., Pedregosa, F., Locatello, F., & Rätsch, G. (2021). Boosting variational inference with locally adaptive step-sizes. In Proceedings of the Thirtieth International Joint Conference on Artificial Intelligence (pp. 2337–2343). Montreal, Canada: International Joint Conferences on Artificial Intelligence. https://doi.org/10.24963/ijcai.2021/322' chicago: Dresdner, Gideon, Saurav Shekhar, Fabian Pedregosa, Francesco Locatello, and Gunnar Rätsch. “Boosting Variational Inference with Locally Adaptive Step-Sizes.” In Proceedings of the Thirtieth International Joint Conference on Artificial Intelligence, 2337–43. International Joint Conferences on Artificial Intelligence, 2021. https://doi.org/10.24963/ijcai.2021/322. ieee: G. Dresdner, S. Shekhar, F. Pedregosa, F. Locatello, and G. Rätsch, “Boosting variational inference with locally adaptive step-sizes,” in Proceedings of the Thirtieth International Joint Conference on Artificial Intelligence, Montreal, Canada, 2021, pp. 2337–2343. ista: 'Dresdner G, Shekhar S, Pedregosa F, Locatello F, Rätsch G. 2021. Boosting variational inference with locally adaptive step-sizes. Proceedings of the Thirtieth International Joint Conference on Artificial Intelligence. IJCAI: International Joint Conference on Artificial Intelligence, 2337–2343.' mla: Dresdner, Gideon, et al. “Boosting Variational Inference with Locally Adaptive Step-Sizes.” Proceedings of the Thirtieth International Joint Conference on Artificial Intelligence, International Joint Conferences on Artificial Intelligence, 2021, pp. 2337–43, doi:10.24963/ijcai.2021/322. short: G. Dresdner, S. Shekhar, F. Pedregosa, F. Locatello, G. Rätsch, in:, Proceedings of the Thirtieth International Joint Conference on Artificial Intelligence, International Joint Conferences on Artificial Intelligence, 2021, pp. 2337–2343. conference: end_date: 2021-08-27 location: Montreal, Canada name: 'IJCAI: International Joint Conference on Artificial Intelligence' start_date: 2021-08-19 date_created: 2023-08-22T14:05:14Z date_published: 2021-05-19T00:00:00Z date_updated: 2023-09-11T11:14:30Z day: '19' department: - _id: FrLo doi: 10.24963/ijcai.2021/322 extern: '1' external_id: arxiv: - '2105.09240' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2105.09240 month: '05' oa: 1 oa_version: Published Version page: 2337-2343 publication: Proceedings of the Thirtieth International Joint Conference on Artificial Intelligence publication_identifier: eisbn: - '9780999241196' publication_status: published publisher: International Joint Conferences on Artificial Intelligence quality_controlled: '1' status: public title: Boosting variational inference with locally adaptive step-sizes type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2021' ...