---
_id: '1756'
abstract:
- lang: eng
text: We report on the electronic transport properties of multiple-gate devices
fabricated from undoped silicon nanowires. Understanding and control of the relevant
transport mechanisms was achieved by means of local electrostatic gating and temperature-dependent
measurements. The roles of the source/drain contacts and of the silicon channel
could be independently evaluated and tuned. Wrap gates surrounding the silicide-silicon
contact interfaces were proved to be effective in inducing a full suppression
of the contact Schottky barriers, thereby enabling carrier injection down to liquid
helium temperature. By independently tuning the effective Schottky barrier heights,
a variety of reconfigurable device functionalities could be obtained. In particular,
the same nanowire device could be configured to work as a Schottky barrier transistor,
a Schottky diode, or a p-n diode with tunable polarities. This versatility was
eventually exploited to realize a NAND logic gate with gain well above one.
acknowledgement: This work was supported by the Agence Nationale de la Recherche (ANR)
through the ACCESS and COHESION projects and by the European Commission through
the Chemtronics program MEST-CT-2005-020513
author:
- first_name: Massimo
full_name: Mongillo, Massimo
last_name: Mongillo
- first_name: Panayotis
full_name: Spathis, Panayotis N
last_name: Spathis
- first_name: Georgios
full_name: Georgios Katsaros
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
- first_name: Pascal
full_name: Gentile, Pascal
last_name: Gentile
- first_name: Silvano
full_name: De Franceschi, Silvano
last_name: De Franceschi
citation:
ama: Mongillo M, Spathis P, Katsaros G, Gentile P, De Franceschi S. Multifunctional
devices and logic gates with undoped silicon nanowires. Nano Letters. 2012;12(6):3074-3079.
doi:10.1021/nl300930m
apa: Mongillo, M., Spathis, P., Katsaros, G., Gentile, P., & De Franceschi,
S. (2012). Multifunctional devices and logic gates with undoped silicon nanowires.
Nano Letters. American Chemical Society. https://doi.org/10.1021/nl300930m
chicago: Mongillo, Massimo, Panayotis Spathis, Georgios Katsaros, Pascal Gentile,
and Silvano De Franceschi. “Multifunctional Devices and Logic Gates with Undoped
Silicon Nanowires.” Nano Letters. American Chemical Society, 2012. https://doi.org/10.1021/nl300930m.
ieee: M. Mongillo, P. Spathis, G. Katsaros, P. Gentile, and S. De Franceschi, “Multifunctional
devices and logic gates with undoped silicon nanowires,” Nano Letters,
vol. 12, no. 6. American Chemical Society, pp. 3074–3079, 2012.
ista: Mongillo M, Spathis P, Katsaros G, Gentile P, De Franceschi S. 2012. Multifunctional
devices and logic gates with undoped silicon nanowires. Nano Letters. 12(6), 3074–3079.
mla: Mongillo, Massimo, et al. “Multifunctional Devices and Logic Gates with Undoped
Silicon Nanowires.” Nano Letters, vol. 12, no. 6, American Chemical Society,
2012, pp. 3074–79, doi:10.1021/nl300930m.
short: M. Mongillo, P. Spathis, G. Katsaros, P. Gentile, S. De Franceschi, Nano
Letters 12 (2012) 3074–3079.
date_created: 2018-12-11T11:53:50Z
date_published: 2012-06-13T00:00:00Z
date_updated: 2021-01-12T06:53:00Z
day: '13'
doi: 10.1021/nl300930m
extern: 1
intvolume: ' 12'
issue: '6'
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1208.1465
month: '06'
oa: 1
page: 3074 - 3079
publication: Nano Letters
publication_status: published
publisher: American Chemical Society
publist_id: '5368'
quality_controlled: 0
status: public
title: Multifunctional devices and logic gates with undoped silicon nanowires
type: journal_article
volume: 12
year: '2012'
...
---
_id: '1757'
abstract:
- lang: eng
text: Self-assembled Ge wires with a height of only 3 unit cells and a length of
up to 2 micrometers were grown on Si(001) by means of a catalyst-free method based
on molecular beam epitaxy. The wires grow horizontally along either the [100]
or the [010] direction. On atomically flat surfaces, they exhibit a highly uniform,
triangular cross section. A simple thermodynamic model accounts for the existence
of a preferential base width for longitudinal expansion, in quantitative agreement
with the experimental findings. Despite the absence of intentional doping, the
first transistor-type devices made from single wires show low-resistive electrical
contacts and single-hole transport at sub-Kelvin temperatures. In view of their
exceptionally small and self-defined cross section, these Ge wires hold promise
for the realization of hole systems with exotic properties and provide a new development
route for silicon-based nanoelectronics.
acknowledgement: We acknowledge the financial support by the DFG SPP1386, P. Chen
and D. J. Thurmer for MBE assistance, R. Wacquez for providing the ultrathin SOI
wafers, and G. Bauer, Y. Hu, X. Jehl, S. Kiravittaya, C. Klöffel, E. J. H. Lee,
F. Liu, D. Loss, and S. Mahapatra for helpful discussions. G. K. acknowledges support
from the European commission via a Marie Curie Carrer Integration Grant. S. D. F.
acknowledges support from the European Research Council through the starting grant
program
author:
- first_name: Jianjun
full_name: Zhang, Jianjun
last_name: Zhang
- first_name: Georgios
full_name: Georgios Katsaros
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
- first_name: Francesco
full_name: Montalenti, Francesco
last_name: Montalenti
- first_name: Daniele
full_name: Scopece, Daniele
last_name: Scopece
- first_name: Roman
full_name: Rezaev, Roman O
last_name: Rezaev
- first_name: Christine
full_name: Mickel, Christine H
last_name: Mickel
- first_name: Bernd
full_name: Rellinghaus, Bernd
last_name: Rellinghaus
- first_name: Leo
full_name: Miglio, Leo P
last_name: Miglio
- first_name: Silvano
full_name: De Franceschi, Silvano
last_name: De Franceschi
- first_name: Armando
full_name: Rastelli, Armando
last_name: Rastelli
- first_name: Oliver
full_name: Schmidt, Oliver G
last_name: Schmidt
citation:
ama: Zhang J, Katsaros G, Montalenti F, et al. Monolithic growth of ultrathin Ge
nanowires on Si(001) . Physical Review Letters. 2012;109(8). doi:10.1103/PhysRevLett.109.085502
apa: Zhang, J., Katsaros, G., Montalenti, F., Scopece, D., Rezaev, R., Mickel, C.,
… Schmidt, O. (2012). Monolithic growth of ultrathin Ge nanowires on Si(001) .
Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.109.085502
chicago: Zhang, Jianjun, Georgios Katsaros, Francesco Montalenti, Daniele Scopece,
Roman Rezaev, Christine Mickel, Bernd Rellinghaus, et al. “Monolithic Growth of
Ultrathin Ge Nanowires on Si(001) .” Physical Review Letters. American
Physical Society, 2012. https://doi.org/10.1103/PhysRevLett.109.085502.
ieee: J. Zhang et al., “Monolithic growth of ultrathin Ge nanowires on Si(001)
,” Physical Review Letters, vol. 109, no. 8. American Physical Society,
2012.
ista: Zhang J, Katsaros G, Montalenti F, Scopece D, Rezaev R, Mickel C, Rellinghaus
B, Miglio L, De Franceschi S, Rastelli A, Schmidt O. 2012. Monolithic growth of
ultrathin Ge nanowires on Si(001) . Physical Review Letters. 109(8).
mla: Zhang, Jianjun, et al. “Monolithic Growth of Ultrathin Ge Nanowires on Si(001)
.” Physical Review Letters, vol. 109, no. 8, American Physical Society,
2012, doi:10.1103/PhysRevLett.109.085502.
short: J. Zhang, G. Katsaros, F. Montalenti, D. Scopece, R. Rezaev, C. Mickel, B.
Rellinghaus, L. Miglio, S. De Franceschi, A. Rastelli, O. Schmidt, Physical Review
Letters 109 (2012).
date_created: 2018-12-11T11:53:51Z
date_published: 2012-08-23T00:00:00Z
date_updated: 2021-01-12T06:53:00Z
day: '23'
doi: 10.1103/PhysRevLett.109.085502
extern: 1
intvolume: ' 109'
issue: '8'
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1208.0666
month: '08'
oa: 1
publication: Physical Review Letters
publication_status: published
publisher: American Physical Society
publist_id: '5367'
quality_controlled: 0
status: public
title: 'Monolithic growth of ultrathin Ge nanowires on Si(001) '
type: journal_article
volume: 109
year: '2012'
...
---
_id: '1758'
abstract:
- lang: eng
text: We studied the low-energy states of spin-1/2 quantum dots defined in InAs/InP
nanowires and coupled to aluminum superconducting leads. By varying the superconducting
gap Δ with a magnetic field B we investigated the transition from strong coupling
Δ≪T K to weak-coupling Δ≫T K, where T K is the Kondo temperature. Below the critical
field, we observe a persisting zero-bias Kondo resonance that vanishes only for
low B or higher temperatures, leaving the room to more robust subgap structures
at bias voltages between Δ and 2Δ. For strong and approximately symmetric tunnel
couplings, a Josephson supercurrent is observed in addition to the Kondo peak.
We ascribe the coexistence of a Kondo resonance and a superconducting gap to a
significant density of intragap quasiparticle states, and the finite-bias subgap
structures to tunneling through Shiba states. Our results, supported by numerical
calculations, own relevance also in relation to tunnel-spectroscopy experiments
aiming at the observation of Majorana fermions in hybrid nanostructures.
acknowledgement: This work was supported by the EU Marie Curie program and by the
Agence Nationale de la Recherche. R. A. acknowledges support from the Spanish Ministry
of Science and Innovation through Grant No. FIS2009-08744
author:
- first_name: Eduardo
full_name: Lee, Eduardo J
last_name: Lee
- first_name: Xiaocheng
full_name: Jiang, Xiaocheng
last_name: Jiang
- first_name: Ramón
full_name: Aguado, Ramón
last_name: Aguado
- first_name: Georgios
full_name: Georgios Katsaros
id: 38DB5788-F248-11E8-B48F-1D18A9856A87
last_name: Katsaros
- first_name: Charles
full_name: Lieber, Charles M
last_name: Lieber
- first_name: Silvano
full_name: De Franceschi, Silvano
last_name: De Franceschi
citation:
ama: Lee E, Jiang X, Aguado R, Katsaros G, Lieber C, De Franceschi S. Zero-bias
anomaly in a nanowire quantum dot coupled to superconductors. Physical Review
Letters. 2012;109(18). doi:10.1103/PhysRevLett.109.186802
apa: Lee, E., Jiang, X., Aguado, R., Katsaros, G., Lieber, C., & De Franceschi,
S. (2012). Zero-bias anomaly in a nanowire quantum dot coupled to superconductors.
Physical Review Letters. American Physical Society. https://doi.org/10.1103/PhysRevLett.109.186802
chicago: Lee, Eduardo, Xiaocheng Jiang, Ramón Aguado, Georgios Katsaros, Charles
Lieber, and Silvano De Franceschi. “Zero-Bias Anomaly in a Nanowire Quantum Dot
Coupled to Superconductors.” Physical Review Letters. American Physical
Society, 2012. https://doi.org/10.1103/PhysRevLett.109.186802.
ieee: E. Lee, X. Jiang, R. Aguado, G. Katsaros, C. Lieber, and S. De Franceschi,
“Zero-bias anomaly in a nanowire quantum dot coupled to superconductors,” Physical
Review Letters, vol. 109, no. 18. American Physical Society, 2012.
ista: Lee E, Jiang X, Aguado R, Katsaros G, Lieber C, De Franceschi S. 2012. Zero-bias
anomaly in a nanowire quantum dot coupled to superconductors. Physical Review
Letters. 109(18).
mla: Lee, Eduardo, et al. “Zero-Bias Anomaly in a Nanowire Quantum Dot Coupled to
Superconductors.” Physical Review Letters, vol. 109, no. 18, American Physical
Society, 2012, doi:10.1103/PhysRevLett.109.186802.
short: E. Lee, X. Jiang, R. Aguado, G. Katsaros, C. Lieber, S. De Franceschi, Physical
Review Letters 109 (2012).
date_created: 2018-12-11T11:53:51Z
date_published: 2012-10-31T00:00:00Z
date_updated: 2021-01-12T06:53:01Z
day: '31'
doi: 10.1103/PhysRevLett.109.186802
extern: 1
intvolume: ' 109'
issue: '18'
main_file_link:
- open_access: '1'
url: http://arxiv.org/abs/1207.1259
month: '10'
oa: 1
publication: Physical Review Letters
publication_status: published
publisher: American Physical Society
publist_id: '5366'
quality_controlled: 0
status: public
title: Zero-bias anomaly in a nanowire quantum dot coupled to superconductors
type: journal_article
volume: 109
year: '2012'
...
---
_id: '17613'
abstract:
- lang: eng
text: We study the interaction of a supermassive black hole (SMBH) binary and a
standard radiatively efficient thin accretion disk. We examine steady-state configurations
of the disk and migrating SMBH system, self-consistently accounting for tidal
and viscous torques and heating, radiative diffusion limited cooling, gas and
radiation pressure, and the decay of the binary's orbit. We obtain a "phase diagram"
of the system as a function of binary parameters, showing regimes in which both
the disk structure and migration have a different character. Although massive
binaries can create a central gap in the disk at large radii, the tidal barrier
of the secondary causes a significant pile-up of gas outside of its orbit, which
can lead to the closing of the gap. We find that this spillover occurs at an orbital
separation as large as ~200 M_7^{-1/2} gravitational radii, where M = 10^7 M_7
Msun is the total binary mass. If the secondary is less massive than ~10^6 Msun,
then the gap is closed before gravitational waves (GWs) start dominating the orbital
decay. In this regime, the disk is still strongly perturbed, but the piled-up
gas continuously overflows as in a porous dam, and crosses inside the secondary's
orbit. The corresponding migration rate, which we label Type 1.5, is slower than
the usual limiting cases known as Type I and II migration. Compared to an unperturbed
disk, the steady-state disk in the overflowing regime is up to several hundred
times brighter in the optical bands. Surveys such as PanSTARRS or LSST may discover
the periodic variability of this population of binaries. Our results imply that
the circumbinary disks around SMBHs can extend to small radii during the last
stages of their merger, when they are detectable by LISA, and may produce coincident
electromagnetic (EM) emission similar to active galactic nuclei (AGN).
alternative_title:
- 'Overflow and migration: SMBH binaries'
article_processing_charge: No
article_type: original
author:
- first_name: Bence
full_name: Kocsis, Bence
last_name: Kocsis
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: Abraham
full_name: Loeb, Abraham
last_name: Loeb
citation:
ama: 'Kocsis B, Haiman Z, Loeb A. Gas pile-up, gap overflow and Type 1.5 migration
in circumbinary discs: Application to supermassive black hole binaries. Monthly
Notices of the Royal Astronomical Society. 2012;427(3):2680-2700. doi:10.1111/j.1365-2966.2012.22118.x'
apa: 'Kocsis, B., Haiman, Z., & Loeb, A. (2012). Gas pile-up, gap overflow and
Type 1.5 migration in circumbinary discs: Application to supermassive black hole
binaries. Monthly Notices of the Royal Astronomical Society. Oxford University
Press. https://doi.org/10.1111/j.1365-2966.2012.22118.x'
chicago: 'Kocsis, Bence, Zoltán Haiman, and Abraham Loeb. “Gas Pile-up, Gap Overflow
and Type 1.5 Migration in Circumbinary Discs: Application to Supermassive Black
Hole Binaries.” Monthly Notices of the Royal Astronomical Society. Oxford
University Press, 2012. https://doi.org/10.1111/j.1365-2966.2012.22118.x.'
ieee: 'B. Kocsis, Z. Haiman, and A. Loeb, “Gas pile-up, gap overflow and Type 1.5
migration in circumbinary discs: Application to supermassive black hole binaries,”
Monthly Notices of the Royal Astronomical Society, vol. 427, no. 3. Oxford
University Press, pp. 2680–2700, 2012.'
ista: 'Kocsis B, Haiman Z, Loeb A. 2012. Gas pile-up, gap overflow and Type 1.5
migration in circumbinary discs: Application to supermassive black hole binaries.
Monthly Notices of the Royal Astronomical Society. 427(3), 2680–2700.'
mla: 'Kocsis, Bence, et al. “Gas Pile-up, Gap Overflow and Type 1.5 Migration in
Circumbinary Discs: Application to Supermassive Black Hole Binaries.” Monthly
Notices of the Royal Astronomical Society, vol. 427, no. 3, Oxford University
Press, 2012, pp. 2680–700, doi:10.1111/j.1365-2966.2012.22118.x.'
short: B. Kocsis, Z. Haiman, A. Loeb, Monthly Notices of the Royal Astronomical
Society 427 (2012) 2680–2700.
date_created: 2024-09-05T13:28:17Z
date_published: 2012-12-11T00:00:00Z
date_updated: 2024-09-24T07:40:02Z
day: '11'
doi: 10.1111/j.1365-2966.2012.22118.x
extern: '1'
intvolume: ' 427'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1111/j.1365-2966.2012.22118.x
month: '12'
oa: 1
oa_version: Published Version
page: 2680-2700
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
issn:
- 0035-8711
- 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Gas pile-up, gap overflow and Type 1.5 migration in circumbinary discs: Application
to supermassive black hole binaries'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 427
year: '2012'
...
---
_id: '17636'
abstract:
- lang: eng
text: It is commonly believed that the earliest stages of star formation in the
Universe were self-regulated by global radiation backgrounds - either by the ultraviolet
(UV) Lyman-Werner (LW) photons emitted by the first stars (directly photodissociating
H2), or by the X-rays produced by accretion on to the black hole (BH) remnants
of these stars (heating the gas but catalysing H2 formation). Recent studies have
suggested that a significant fraction of the first stars may have had low masses
(a few M⊙). Such stars do not leave BH remnants and they have softer spectra,
with copious infrared (IR) radiation at photon energies ∼1 eV. Similar to LW and
X-ray photons, these photons have a mean-free path comparable to the Hubble distance,
building up an early IR background. Here we show that if soft-spectrum stars,
with masses of a few M⊙, contributed ≳0.3 per cent of the UV background (or their
mass fraction exceeded ∼80 per cent), then their IR radiation dominated radiative
feedback in the early Universe. The feedback is different from the UV feedback
from high-mass stars, and occurs through the photodetachment of H− ions, necessary
for efficient H2 formation. Nevertheless, we find that the baryon fraction which
must be incorporated into low-mass stars in order to suppress H2 cooling is only
a factor of a few higher than for high-mass stars.
article_processing_charge: No
article_type: original
author:
- first_name: J.
full_name: Wolcott-Green, J.
last_name: Wolcott-Green
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: 'Wolcott-Green J, Haiman Z. Feedback from the infrared background in the early
universe. Monthly Notices of the Royal Astronomical Society: Letters. 2012;425(1):L51-L55.
doi:10.1111/j.1745-3933.2012.01298.x'
apa: 'Wolcott-Green, J., & Haiman, Z. (2012). Feedback from the infrared background
in the early universe. Monthly Notices of the Royal Astronomical Society: Letters.
Oxford University Press. https://doi.org/10.1111/j.1745-3933.2012.01298.x'
chicago: 'Wolcott-Green, J., and Zoltán Haiman. “Feedback from the Infrared Background
in the Early Universe.” Monthly Notices of the Royal Astronomical Society:
Letters. Oxford University Press, 2012. https://doi.org/10.1111/j.1745-3933.2012.01298.x.'
ieee: 'J. Wolcott-Green and Z. Haiman, “Feedback from the infrared background in
the early universe,” Monthly Notices of the Royal Astronomical Society: Letters,
vol. 425, no. 1. Oxford University Press, pp. L51–L55, 2012.'
ista: 'Wolcott-Green J, Haiman Z. 2012. Feedback from the infrared background in
the early universe. Monthly Notices of the Royal Astronomical Society: Letters.
425(1), L51–L55.'
mla: 'Wolcott-Green, J., and Zoltán Haiman. “Feedback from the Infrared Background
in the Early Universe.” Monthly Notices of the Royal Astronomical Society:
Letters, vol. 425, no. 1, Oxford University Press, 2012, pp. L51–55, doi:10.1111/j.1745-3933.2012.01298.x.'
short: 'J. Wolcott-Green, Z. Haiman, Monthly Notices of the Royal Astronomical Society:
Letters 425 (2012) L51–L55.'
date_created: 2024-09-06T07:07:07Z
date_published: 2012-09-01T00:00:00Z
date_updated: 2024-09-24T11:29:36Z
day: '01'
doi: 10.1111/j.1745-3933.2012.01298.x
extern: '1'
intvolume: ' 425'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1111/j.1745-3933.2012.01298.x
month: '09'
oa: 1
oa_version: Published Version
page: L51-L55
publication: 'Monthly Notices of the Royal Astronomical Society: Letters'
publication_identifier:
issn:
- 1745-3925
- 1745-3933
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Feedback from the infrared background in the early universe
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 425
year: '2012'
...
---
_id: '17651'
abstract:
- lang: eng
text: 'A decade after their first discovery, the origin of giant supermassive black
holes (SMBHs), with masses in excess of 109 Msolar, at redshifts as early as z
> 6, remains a puzzle. One possibility is that stellar-mass ``seed'''' BHs, left
behind by the first stars, accrete gas at close to the Eddington limit during
a large fraction (>~ 50%) of the time. While maintaining such a high accretion
rate may itself be difficult, here we focus on another, less commonly discussed
problem in this scenario: unless BH seed formation and growth are preferentially
suppressed in less massive protogalaxies, the mass density in M~106Msolar SMBHs
at z ~ 6 already exceeds the locally observed SMBH mass density by several orders
of magnitude. We show that the X-rays from the earliest accreting BHs themselves
can cause a self-regulation, by partially ionizing and heating the intergalactic
medium (IGM). This ``global warming'''' suppresses the formation and growth of
subsequent generations of BHs in low-mass halos, and can produce excellent agreement
with recent estimates of the z = 6 SMBH mass function, without impeding the growth
of the largest (M>~109Msolar) holes, which reside in the most massive galaxies
that formed first. The proposed gravitational-wave observatory eLISA could detect
several tens of major mergers between SMBHs at z > 6.'
article_processing_charge: No
author:
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: Takamitsu
full_name: Tanaka, Takamitsu
last_name: Tanaka
- first_name: Rosalba
full_name: Perna, Rosalba
last_name: Perna
citation:
ama: 'Haiman Z, Tanaka T, Perna R. Self-regulating the early growth of black holes
through global warming. In: AIP Conference Proceedings. Vol 1480. American
Institute of Physics; 2012:303-308. doi:10.1063/1.4754372'
apa: 'Haiman, Z., Tanaka, T., & Perna, R. (2012). Self-regulating the early
growth of black holes through global warming. In AIP Conference Proceedings
(Vol. 1480, pp. 303–308). Kyoto, Japan: American Institute of Physics. https://doi.org/10.1063/1.4754372'
chicago: Haiman, Zoltán, Takamitsu Tanaka, and Rosalba Perna. “Self-Regulating the
Early Growth of Black Holes through Global Warming.” In AIP Conference Proceedings,
1480:303–8. American Institute of Physics, 2012. https://doi.org/10.1063/1.4754372.
ieee: Z. Haiman, T. Tanaka, and R. Perna, “Self-regulating the early growth of black
holes through global warming,” in AIP Conference Proceedings, Kyoto, Japan,
2012, vol. 1480, pp. 303–308.
ista: Haiman Z, Tanaka T, Perna R. 2012. Self-regulating the early growth of black
holes through global warming. AIP Conference Proceedings. FIRST STARS IV - From
Hayashi to the Future vol. 1480, 303–308.
mla: Haiman, Zoltán, et al. “Self-Regulating the Early Growth of Black Holes through
Global Warming.” AIP Conference Proceedings, vol. 1480, American Institute
of Physics, 2012, pp. 303–08, doi:10.1063/1.4754372.
short: Z. Haiman, T. Tanaka, R. Perna, in:, AIP Conference Proceedings, American
Institute of Physics, 2012, pp. 303–308.
conference:
end_date: 2012-05-25
location: Kyoto, Japan
name: FIRST STARS IV - From Hayashi to the Future
start_date: 2012-05-21
date_created: 2024-09-06T07:29:59Z
date_published: 2012-09-12T00:00:00Z
date_updated: 2024-09-24T13:16:41Z
day: '12'
doi: 10.1063/1.4754372
extern: '1'
intvolume: ' 1480'
language:
- iso: eng
main_file_link:
- url: https://doi.org/10.1063/1.4754372
month: '09'
oa_version: None
page: 303-308
publication: AIP Conference Proceedings
publication_identifier:
issn:
- 0094-243X
publication_status: published
publisher: American Institute of Physics
quality_controlled: '1'
scopus_import: '1'
status: public
title: Self-regulating the early growth of black holes through global warming
type: conference
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 1480
year: '2012'
...
---
_id: '17660'
abstract:
- lang: eng
text: Many astrophysical binaries, from planets to black holes, exert strong torques
on their circumbinary accretion discs, and are expected to significantly modify
the disc structure. Despite the several decade long history of the subject, the
joint evolution of the binary + disc system has not been modelled with self-consistent
assumptions for arbitrary mass ratios and accretion rates. Here, we solve the
coupled binary–disc evolution equations analytically in the strongly perturbed
limit, treating the azimuthally averaged angular momentum exchange between the
disc and the binary and the modifications to the density, scaleheight, and viscosity
self-consistently, including viscous and tidal heating, diffusion limited cooling,
radiation pressure and the orbital decay of the binary. We find a solution with
a central cavity and a migration rate similar to those previously obtained for
Type II migration, applicable for large masses and binary separations, and near-equal
mass ratios. However, we identify a distinct new regime, applicable at smaller
separations and masses, and mass ratio in the range 10−3 ≲ q ≲ 0.1. For these
systems, gas piles up outside the binary's orbit, but rather than creating a cavity,
it continuously overflows as in a porous dam. The disc profile is intermediate
between a weakly perturbed disc (producing Type I migration) and a disc with a
gap (with Type II migration). However, the migration rate of the secondary is
typically slower than both Type I and Type II rates. We term this new regime ‘Type
1.5’ migration.
alternative_title:
- 'Overflow and migration: general theory'
article_processing_charge: No
article_type: original
author:
- first_name: Bence
full_name: Kocsis, Bence
last_name: Kocsis
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: Abraham
full_name: Loeb, Abraham
last_name: Loeb
citation:
ama: 'Kocsis B, Haiman Z, Loeb A. Gas pile-up, gap overflow and Type 1.5 migration
in circumbinary discs: General theory. Monthly Notices of the Royal Astronomical
Society. 2012;427(3):2660-2679. doi:10.1111/j.1365-2966.2012.22129.x'
apa: 'Kocsis, B., Haiman, Z., & Loeb, A. (2012). Gas pile-up, gap overflow and
Type 1.5 migration in circumbinary discs: General theory. Monthly Notices of
the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1111/j.1365-2966.2012.22129.x'
chicago: 'Kocsis, Bence, Zoltán Haiman, and Abraham Loeb. “Gas Pile-up, Gap Overflow
and Type 1.5 Migration in Circumbinary Discs: General Theory.” Monthly Notices
of the Royal Astronomical Society. Oxford University Press, 2012. https://doi.org/10.1111/j.1365-2966.2012.22129.x.'
ieee: 'B. Kocsis, Z. Haiman, and A. Loeb, “Gas pile-up, gap overflow and Type 1.5
migration in circumbinary discs: General theory,” Monthly Notices of the Royal
Astronomical Society, vol. 427, no. 3. Oxford University Press, pp. 2660–2679,
2012.'
ista: 'Kocsis B, Haiman Z, Loeb A. 2012. Gas pile-up, gap overflow and Type 1.5
migration in circumbinary discs: General theory. Monthly Notices of the Royal
Astronomical Society. 427(3), 2660–2679.'
mla: 'Kocsis, Bence, et al. “Gas Pile-up, Gap Overflow and Type 1.5 Migration in
Circumbinary Discs: General Theory.” Monthly Notices of the Royal Astronomical
Society, vol. 427, no. 3, Oxford University Press, 2012, pp. 2660–79, doi:10.1111/j.1365-2966.2012.22129.x.'
short: B. Kocsis, Z. Haiman, A. Loeb, Monthly Notices of the Royal Astronomical
Society 427 (2012) 2660–2679.
date_created: 2024-09-06T07:38:16Z
date_published: 2012-12-11T00:00:00Z
date_updated: 2024-09-25T07:21:05Z
day: '11'
doi: 10.1111/j.1365-2966.2012.22129.x
extern: '1'
intvolume: ' 427'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1111/j.1365-2966.2012.22129.x
month: '12'
oa: 1
oa_version: Published Version
page: 2660-2679
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
issn:
- 0035-8711
- 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Gas pile-up, gap overflow and Type 1.5 migration in circumbinary discs: General
theory'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 427
year: '2012'
...
---
_id: '17674'
abstract:
- lang: eng
text: The power spectrum of cosmic infrared background (CIB) anisotropies is sensitive
to the connection between star formation and dark matter haloes over the entire
cosmic star formation history. Here we develop a model that associates star‐forming
galaxies with dark matter haloes and their subhaloes. The model is based on a
parametrized relation between the dust‐processed infrared luminosity and (sub)halo
mass. By adjusting three free parameters, we attempt to simultaneously fit the
four frequency bands of the Planck measurement of the CIB anisotropy power spectrum.
To fit the data, we find that the star formation efficiency must peak on a halo
mass scale of ≈5 × 10^12 M⊙ and the infrared luminosity per unit mass must increase
rapidly with redshift. By comparing our predictions with a well‐calibrated phenomenological
model for shot noise, and with a direct observation of source counts, we show
that the mean duty cycle of the underlying infrared sources must be near unity,
indicating that the CIB is dominated by long‐lived quiescent star formation, rather
than intermittent short ‘starbursts’. Despite the improved flexibility of our
model, the best simultaneous fit to all four Planck channels remains relatively
poor. We discuss possible further extensions to alleviate the remaining tension
with the data. Our model presents a theoretical framework for a future joint analysis
of both background anisotropy and source count measurements.
alternative_title:
- Improved models for CIB anisotropies
article_processing_charge: No
article_type: original
author:
- first_name: Cien
full_name: Shang, Cien
last_name: Shang
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: Lloyd
full_name: Knox, Lloyd
last_name: Knox
- first_name: S. Peng
full_name: Oh, S. Peng
last_name: Oh
citation:
ama: 'Shang C, Haiman Z, Knox L, Oh SP. Improved models for cosmic infrared background
anisotropies: New constraints on the infrared galaxy population. Monthly Notices
of the Royal Astronomical Society. 2012;421(4):2832-2845. doi:10.1111/j.1365-2966.2012.20510.x'
apa: 'Shang, C., Haiman, Z., Knox, L., & Oh, S. P. (2012). Improved models for
cosmic infrared background anisotropies: New constraints on the infrared galaxy
population. Monthly Notices of the Royal Astronomical Society. Oxford University
Press. https://doi.org/10.1111/j.1365-2966.2012.20510.x'
chicago: 'Shang, Cien, Zoltán Haiman, Lloyd Knox, and S. Peng Oh. “Improved Models
for Cosmic Infrared Background Anisotropies: New Constraints on the Infrared Galaxy
Population.” Monthly Notices of the Royal Astronomical Society. Oxford
University Press, 2012. https://doi.org/10.1111/j.1365-2966.2012.20510.x.'
ieee: 'C. Shang, Z. Haiman, L. Knox, and S. P. Oh, “Improved models for cosmic infrared
background anisotropies: New constraints on the infrared galaxy population,” Monthly
Notices of the Royal Astronomical Society, vol. 421, no. 4. Oxford University
Press, pp. 2832–2845, 2012.'
ista: 'Shang C, Haiman Z, Knox L, Oh SP. 2012. Improved models for cosmic infrared
background anisotropies: New constraints on the infrared galaxy population. Monthly
Notices of the Royal Astronomical Society. 421(4), 2832–2845.'
mla: 'Shang, Cien, et al. “Improved Models for Cosmic Infrared Background Anisotropies:
New Constraints on the Infrared Galaxy Population.” Monthly Notices of the
Royal Astronomical Society, vol. 421, no. 4, Oxford University Press, 2012,
pp. 2832–45, doi:10.1111/j.1365-2966.2012.20510.x.'
short: C. Shang, Z. Haiman, L. Knox, S.P. Oh, Monthly Notices of the Royal Astronomical
Society 421 (2012) 2832–2845.
date_created: 2024-09-06T07:50:37Z
date_published: 2012-04-10T00:00:00Z
date_updated: 2024-09-25T08:36:17Z
day: '10'
doi: 10.1111/j.1365-2966.2012.20510.x
extern: '1'
intvolume: ' 421'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1111/j.1365-2966.2012.20510.x
month: '04'
oa: 1
oa_version: Published Version
page: 2832-2845
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Improved models for cosmic infrared background anisotropies: New constraints
on the infrared galaxy population'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 421
year: '2012'
...
---
_id: '17675'
abstract:
- lang: eng
text: In this paper, we show that Minkowski Functionals (MFs) of weak gravitational
lensing (WL) convergence maps contain significant non-Gaussian, cosmology-dependent
information. To do this, we use a large suite of cosmological ray-tracing N-body
simulations to create mock WL convergence maps, and study the cosmological information
content of MFs derived from these maps. Our suite consists of 80 independent 512^3
N-body runs, covering seven different cosmologies, varying three cosmological
parameters Omega_m, w, and sigma_8 one at a time, around a fiducial LambdaCDM
model. In each cosmology, we use ray-tracing to create a thousand pseudo-independent
12 deg^2 convergence maps, and use these in a Monte Carlo procedure to estimate
the joint confidence contours on the above three parameters. We include redshift
tomography at three different source redshifts z_s=1, 1.5, 2, explore five different
smoothing scales theta_G=1, 2, 3, 5, 10 arcmin, and explicitly compare and combine
the MFs with the WL power spectrum. We find that the MFs capture a substantial
amount of information from non-Gaussian features of convergence maps, i.e. beyond
the power spectrum. The MFs are particularly well suited to break degeneracies
and to constrain the dark energy equation of state parameter w (by a factor of
~ three better than from the power spectrum alone). The non-Gaussian information
derives partly from the one-point function of the convergence (through V_0, the
"area" MF), and partly through non-linear spatial information (through combining
different smoothing scales for V_0, and through V_1 and V_2, the boundary length
and genus MFs, respectively). In contrast to the power spectrum, the best constraints
from the MFs are obtained only when multiple smoothing scales are combined.
article_number: '103513'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Jan M.
full_name: Kratochvil, Jan M.
last_name: Kratochvil
- first_name: Eugene A.
full_name: Lim, Eugene A.
last_name: Lim
- first_name: Sheng
full_name: Wang, Sheng
last_name: Wang
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: Morgan
full_name: May, Morgan
last_name: May
- first_name: Kevin
full_name: Huffenberger, Kevin
last_name: Huffenberger
citation:
ama: Kratochvil JM, Lim EA, Wang S, Haiman Z, May M, Huffenberger K. Probing cosmology
with weak lensing Minkowski functionals. Physical Review D. 2012;85(10).
doi:10.1103/physrevd.85.103513
apa: Kratochvil, J. M., Lim, E. A., Wang, S., Haiman, Z., May, M., & Huffenberger,
K. (2012). Probing cosmology with weak lensing Minkowski functionals. Physical
Review D. American Physical Society. https://doi.org/10.1103/physrevd.85.103513
chicago: Kratochvil, Jan M., Eugene A. Lim, Sheng Wang, Zoltán Haiman, Morgan May,
and Kevin Huffenberger. “Probing Cosmology with Weak Lensing Minkowski Functionals.”
Physical Review D. American Physical Society, 2012. https://doi.org/10.1103/physrevd.85.103513.
ieee: J. M. Kratochvil, E. A. Lim, S. Wang, Z. Haiman, M. May, and K. Huffenberger,
“Probing cosmology with weak lensing Minkowski functionals,” Physical Review
D, vol. 85, no. 10. American Physical Society, 2012.
ista: Kratochvil JM, Lim EA, Wang S, Haiman Z, May M, Huffenberger K. 2012. Probing
cosmology with weak lensing Minkowski functionals. Physical Review D. 85(10),
103513.
mla: Kratochvil, Jan M., et al. “Probing Cosmology with Weak Lensing Minkowski Functionals.”
Physical Review D, vol. 85, no. 10, 103513, American Physical Society,
2012, doi:10.1103/physrevd.85.103513.
short: J.M. Kratochvil, E.A. Lim, S. Wang, Z. Haiman, M. May, K. Huffenberger, Physical
Review D 85 (2012).
date_created: 2024-09-06T07:51:45Z
date_published: 2012-04-10T00:00:00Z
date_updated: 2024-09-25T08:41:09Z
day: '10'
doi: 10.1103/physrevd.85.103513
extern: '1'
external_id:
arxiv:
- '1109.6334'
intvolume: ' 85'
issue: '10'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.1109.6334'
month: '04'
oa: 1
oa_version: Preprint
publication: Physical Review D
publication_identifier:
issn:
- 1550-7998
- 1550-2368
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Probing cosmology with weak lensing Minkowski functionals
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 85
year: '2012'
...
---
_id: '17678'
abstract:
- lang: eng
text: 'The spectra of several high-redshift (z>6) quasars have shown evidence for
a Gunn-Peterson (GP) damping wing, indicating a substantial mean neutral hydrogen
fraction (x_HI > 0.03) in the z ~ 6 intergalactic medium (IGM). However, previous
analyses assumed that the IGM was uniformly ionized outside of the quasar''s HII
region. Here we relax this assumption and model patchy reionization scenarios
for a range of IGM and quasar parameters. We quantify the impact of these differences
on the inferred x_HI, by fitting the spectra of three quasars: SDSS J1148+5251
(z=6.419), J1030+0524 (z=6.308), and J1623+3112 (z=6.247). We find that the best-fit
values of x_HI in the patchy models agree well with the uniform case. More importantly,
we confirm that the observed spectra favor the presence of a GP damping wing,
with peak likelihoods decreasing by factors of > few - 10 when the spectra are
modeled without a damping wing. We also find that the Ly alpha absorption spectra,
by themselves, cannot distinguish the damping wing in a relatively neutral IGM
from a damping wing in a highly ionized IGM, caused either by an isolated neutral
patch, or by a damped Ly alpha absorber (DLA). However, neutral patches in a highly
ionized universe (x_HI < 0.01), and DLAs with the large required column densities
(N_HI > few x 10^{20} cm^{-2}) are both rare. As a result, when we include reasonable
prior probabilities for the line of sight (LOS) to intercept either a neutral
patch or a DLA at the required distance of ~ 40-60 comoving Mpc away from the
quasar, we find strong lower limits on the neutral fraction in the IGM, x_HI >
0.1 (at 95% confidence). This strengthens earlier claims that a substantial global
fraction of hydrogen in the z~6 IGM is in neutral form.'
article_processing_charge: No
article_type: original
author:
- first_name: Joshua
full_name: Schroeder, Joshua
last_name: Schroeder
- first_name: Andrei
full_name: Mesinger, Andrei
last_name: Mesinger
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: 'Schroeder J, Mesinger A, Haiman Z. Evidence of Gunn–Peterson damping wings
in high-z quasar spectra: Strengthening the case for incomplete reionization at
z ∼ 6–7. Monthly Notices of the Royal Astronomical Society. 2012;428(4):3058-3071.
doi:10.1093/mnras/sts253'
apa: 'Schroeder, J., Mesinger, A., & Haiman, Z. (2012). Evidence of Gunn–Peterson
damping wings in high-z quasar spectra: Strengthening the case for incomplete
reionization at z ∼ 6–7. Monthly Notices of the Royal Astronomical Society.
Oxford University Press. https://doi.org/10.1093/mnras/sts253'
chicago: 'Schroeder, Joshua, Andrei Mesinger, and Zoltán Haiman. “Evidence of Gunn–Peterson
Damping Wings in High-z Quasar Spectra: Strengthening the Case for Incomplete
Reionization at z ∼ 6–7.” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2012. https://doi.org/10.1093/mnras/sts253.'
ieee: 'J. Schroeder, A. Mesinger, and Z. Haiman, “Evidence of Gunn–Peterson damping
wings in high-z quasar spectra: Strengthening the case for incomplete reionization
at z ∼ 6–7,” Monthly Notices of the Royal Astronomical Society, vol. 428,
no. 4. Oxford University Press, pp. 3058–3071, 2012.'
ista: 'Schroeder J, Mesinger A, Haiman Z. 2012. Evidence of Gunn–Peterson damping
wings in high-z quasar spectra: Strengthening the case for incomplete reionization
at z ∼ 6–7. Monthly Notices of the Royal Astronomical Society. 428(4), 3058–3071.'
mla: 'Schroeder, Joshua, et al. “Evidence of Gunn–Peterson Damping Wings in High-z
Quasar Spectra: Strengthening the Case for Incomplete Reionization at z ∼ 6–7.”
Monthly Notices of the Royal Astronomical Society, vol. 428, no. 4, Oxford
University Press, 2012, pp. 3058–71, doi:10.1093/mnras/sts253.'
short: J. Schroeder, A. Mesinger, Z. Haiman, Monthly Notices of the Royal Astronomical
Society 428 (2012) 3058–3071.
date_created: 2024-09-06T08:04:35Z
date_published: 2012-11-22T00:00:00Z
date_updated: 2024-09-25T08:53:21Z
day: '22'
doi: 10.1093/mnras/sts253
extern: '1'
intvolume: ' 428'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1093/mnras/sts253
month: '11'
oa: 1
oa_version: Published Version
page: 3058-3071
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
issn:
- 0035-8711
- 1365-2966
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Evidence of Gunn–Peterson damping wings in high-z quasar spectra: Strengthening
the case for incomplete reionization at z ∼ 6–7'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 428
year: '2012'
...
---
_id: '17688'
abstract:
- lang: eng
text: Pulsar timing arrays (PTAs) are expected to detect gravitational waves (GWs)
from individual low-redshift (z<1.5) compact supermassive (M>10^9 Msun) black
hole (SMBH) binaries with orbital periods of approx. 0.1 - 10 yrs. Identifying
the electromagnetic (EM) counterparts of these sources would provide confirmation
of putative direct detections of GWs, present a rare opportunity to study the
environments of compact SMBH binaries, and could enable the use of these sources
as standard sirens for cosmology. Here we consider the feasibility of such an
EM identification. We show that because the host galaxies of resolved PTA sources
are expected to be exceptionally massive and rare, it should be possible to find
unique hosts of resolved sources out to redshift z=0.2. At higher redshifts, the
PTA error boxes are larger, and may contain as many as 100 massive-galaxy interlopers.
The number of candidates, however, remains tractable for follow-up searches in
upcoming wide-field EM surveys. We develop a toy model to characterize the dynamics
and the thermal emission from a geometrically thin, gaseous disc accreting onto
a PTA-source SMBH binary. Our model predicts that at optical and infrared frequencies,
the source should appear similar to a typical luminous active galactic nucleus
(AGN). However, owing to the evacuation of the accretion flow by the binary's
tidal torques, the source might have an unusually low soft X-ray luminosity and
weak UV and broad optical emission lines, as compared to an AGN powered by a single
SMBH with the same total mass. For sources near z=1, the decrement in the rest-frame
UV should be observable as an extremely red optical color. These properties would
make the PTA sources stand out among optically luminous AGN, and could allow their
unique identification.
alternative_title:
- Electromagnetic counterparts of PTA sources
article_processing_charge: No
article_type: original
author:
- first_name: Takamitsu
full_name: Tanaka, Takamitsu
last_name: Tanaka
- first_name: Kristen
full_name: Menou, Kristen
last_name: Menou
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: Tanaka T, Menou K, Haiman Z. Electromagnetic counterparts of supermassive black
hole binaries resolved by pulsar timing arrays. Monthly Notices of the Royal
Astronomical Society. 2012;420(1):705-719. doi:10.1111/j.1365-2966.2011.20083.x
apa: Tanaka, T., Menou, K., & Haiman, Z. (2012). Electromagnetic counterparts
of supermassive black hole binaries resolved by pulsar timing arrays. Monthly
Notices of the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1111/j.1365-2966.2011.20083.x
chicago: Tanaka, Takamitsu, Kristen Menou, and Zoltán Haiman. “Electromagnetic Counterparts
of Supermassive Black Hole Binaries Resolved by Pulsar Timing Arrays.” Monthly
Notices of the Royal Astronomical Society. Oxford University Press, 2012.
https://doi.org/10.1111/j.1365-2966.2011.20083.x.
ieee: T. Tanaka, K. Menou, and Z. Haiman, “Electromagnetic counterparts of supermassive
black hole binaries resolved by pulsar timing arrays,” Monthly Notices of the
Royal Astronomical Society, vol. 420, no. 1. Oxford University Press, pp.
705–719, 2012.
ista: Tanaka T, Menou K, Haiman Z. 2012. Electromagnetic counterparts of supermassive
black hole binaries resolved by pulsar timing arrays. Monthly Notices of the Royal
Astronomical Society. 420(1), 705–719.
mla: Tanaka, Takamitsu, et al. “Electromagnetic Counterparts of Supermassive Black
Hole Binaries Resolved by Pulsar Timing Arrays.” Monthly Notices of the Royal
Astronomical Society, vol. 420, no. 1, Oxford University Press, 2012, pp.
705–19, doi:10.1111/j.1365-2966.2011.20083.x.
short: T. Tanaka, K. Menou, Z. Haiman, Monthly Notices of the Royal Astronomical
Society 420 (2012) 705–719.
date_created: 2024-09-06T08:23:06Z
date_published: 2012-01-23T00:00:00Z
date_updated: 2024-09-25T09:49:01Z
day: '23'
doi: 10.1111/j.1365-2966.2011.20083.x
extern: '1'
intvolume: ' 420'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1111/j.1365-2966.2011.20083.x
month: '01'
oa: 1
oa_version: Published Version
page: 705-719
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Electromagnetic counterparts of supermassive black hole binaries resolved by
pulsar timing arrays
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 420
year: '2012'
...
---
_id: '17705'
abstract:
- lang: eng
text: Observations of high-redshift quasars at z>6 imply that supermassive black
holes (SMBHs) with masses over a billion solar masses were in place less than
1 Gyr after the Big Bang. If these SMBHs assembled from "seed" BHs left behind
by the first stars, then they must have accreted gas at close to the Eddington
limit during a large fraction (>50%) of the time. A generic problem with this
scenario, however, is that the mass density in million-solar-mass SMBHs at z=6
already exceeds the locally observed SMBH mass density by several orders of magnitude;
in order to avoid this overproduction, BH seed formation and growth must become
significantly less efficient in less massive protogalaxies, while proceeding uninterrupted
in the most massive galaxies that formed first. Using Monte-Carlo realizations
of the merger and growth history of BHs, we show that X-rays from the earliest
accreting BHs can provide such a feedback mechanism. Our calculations paint a
self-consistent picture of black-hole-made climate change, in which the first
miniquasars---among them the ancestors of the z>6 quasar SMBHs---globally warm
the IGM and suppress the formation and growth of subsequent generations of BHs.
We present two specific models with global miniquasar feedback that provide excellent
agreement with recent estimates of the z=6 SMBH mass function. For each of these
models, we estimate the rate of BH mergers at z>6 that could be detected by the
proposed gravitational-wave observatory eLISA/NGO.
alternative_title:
- IGM global warming by high-redshift miniquasars
article_processing_charge: No
article_type: original
author:
- first_name: Takamitsu
full_name: Tanaka, Takamitsu
last_name: Tanaka
- first_name: Rosalba
full_name: Perna, Rosalba
last_name: Perna
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: 'Tanaka T, Perna R, Haiman Z. X-ray emission from high-redshift miniquasars:
Self-regulating the population of massive black holes through global warming.
Monthly Notices of the Royal Astronomical Society. 2012;425(4):2974-2987.
doi:10.1111/j.1365-2966.2012.21539.x'
apa: 'Tanaka, T., Perna, R., & Haiman, Z. (2012). X-ray emission from high-redshift
miniquasars: Self-regulating the population of massive black holes through global
warming. Monthly Notices of the Royal Astronomical Society. Oxford University
Press. https://doi.org/10.1111/j.1365-2966.2012.21539.x'
chicago: 'Tanaka, Takamitsu, Rosalba Perna, and Zoltán Haiman. “X-Ray Emission from
High-Redshift Miniquasars: Self-Regulating the Population of Massive Black Holes
through Global Warming.” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2012. https://doi.org/10.1111/j.1365-2966.2012.21539.x.'
ieee: 'T. Tanaka, R. Perna, and Z. Haiman, “X-ray emission from high-redshift miniquasars:
Self-regulating the population of massive black holes through global warming,”
Monthly Notices of the Royal Astronomical Society, vol. 425, no. 4. Oxford
University Press, pp. 2974–2987, 2012.'
ista: 'Tanaka T, Perna R, Haiman Z. 2012. X-ray emission from high-redshift miniquasars:
Self-regulating the population of massive black holes through global warming.
Monthly Notices of the Royal Astronomical Society. 425(4), 2974–2987.'
mla: 'Tanaka, Takamitsu, et al. “X-Ray Emission from High-Redshift Miniquasars:
Self-Regulating the Population of Massive Black Holes through Global Warming.”
Monthly Notices of the Royal Astronomical Society, vol. 425, no. 4, Oxford
University Press, 2012, pp. 2974–87, doi:10.1111/j.1365-2966.2012.21539.x.'
short: T. Tanaka, R. Perna, Z. Haiman, Monthly Notices of the Royal Astronomical
Society 425 (2012) 2974–2987.
date_created: 2024-09-06T08:50:56Z
date_published: 2012-10-01T00:00:00Z
date_updated: 2024-09-25T11:40:30Z
day: '01'
doi: 10.1111/j.1365-2966.2012.21539.x
extern: '1'
intvolume: ' 425'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1111/j.1365-2966.2012.21539.x
month: '10'
oa: 1
oa_version: Published Version
page: 2974-2987
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'X-ray emission from high-redshift miniquasars: Self-regulating the population
of massive black holes through global warming'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 425
year: '2012'
...
---
_id: '767'
abstract:
- lang: eng
text: Synchronous distributed algorithms are easier to design and prove correct
than algorithms that tolerate asynchrony. Yet, in the real world, networks experience
asynchrony and other timing anomalies. In this paper, we address the question
of how to efficiently transform an algorithm that relies on synchronous timing
into an algorithm that tolerates asynchronous executions. We introduce a transformation
technique from synchronous algorithms to indulgent algorithms (Guerraoui, in PODC,
pp. 289-297, 2000), which induces only a constant overhead in terms of time complexity
in well-behaved executions. Our technique is based on a new abstraction we call
an asynchrony detector, which the participating processes implement collectively.
The resulting transformation works for the class of colorless distributed tasks,
including consensus and set agreement. Interestingly, we also show that our technique
is relevant for colored tasks, by applying it to the renaming problem, to obtain
the first indulgent renaming algorithm.
acknowledgement: "Dan Alistarh was supported by the NCCR MICS Project. Corentin Travers
had additional support from INRIA team REGAL and ANR project SPREADS.\r\nThe authors
would like to thank Hagit Attiya and Nikola Kneževi\r\n ́\r\nc for their feed-\r\nback
on previous drafts of this paper, and the anonymous reviewers for their useful comments."
article_processing_charge: No
author:
- first_name: Dan-Adrian
full_name: Alistarh, Dan-Adrian
id: 4A899BFC-F248-11E8-B48F-1D18A9856A87
last_name: Alistarh
orcid: 0000-0003-3650-940X
- first_name: Seth
full_name: Gilbert, Seth
last_name: Gilbert
- first_name: Rachid
full_name: Guerraoui, Rachid
last_name: Guerraoui
- first_name: Corentin
full_name: Travers, Corentin
last_name: Travers
citation:
ama: Alistarh D-A, Gilbert S, Guerraoui R, Travers C. Generating Fast Indulgent
Algorithms. Theory of Computing Systems. 2012;51(4):404-424. doi:10.1007/s00224-012-9407-2
apa: Alistarh, D.-A., Gilbert, S., Guerraoui, R., & Travers, C. (2012). Generating
Fast Indulgent Algorithms. Theory of Computing Systems. Elsevier. https://doi.org/10.1007/s00224-012-9407-2
chicago: Alistarh, Dan-Adrian, Seth Gilbert, Rachid Guerraoui, and Corentin Travers.
“Generating Fast Indulgent Algorithms.” Theory of Computing Systems. Elsevier,
2012. https://doi.org/10.1007/s00224-012-9407-2.
ieee: D.-A. Alistarh, S. Gilbert, R. Guerraoui, and C. Travers, “Generating Fast
Indulgent Algorithms,” Theory of Computing Systems, vol. 51, no. 4. Elsevier,
pp. 404–424, 2012.
ista: Alistarh D-A, Gilbert S, Guerraoui R, Travers C. 2012. Generating Fast Indulgent
Algorithms. Theory of Computing Systems. 51(4), 404–424.
mla: Alistarh, Dan-Adrian, et al. “Generating Fast Indulgent Algorithms.” Theory
of Computing Systems, vol. 51, no. 4, Elsevier, 2012, pp. 404–24, doi:10.1007/s00224-012-9407-2.
short: D.-A. Alistarh, S. Gilbert, R. Guerraoui, C. Travers, Theory of Computing
Systems 51 (2012) 404–424.
date_created: 2018-12-11T11:48:23Z
date_published: 2012-01-01T00:00:00Z
date_updated: 2023-02-23T13:13:40Z
day: '01'
doi: 10.1007/s00224-012-9407-2
extern: '1'
intvolume: ' 51'
issue: '4'
language:
- iso: eng
month: '01'
oa_version: None
page: 404 - 424
publication: Theory of Computing Systems
publication_status: published
publisher: Elsevier
publist_id: '6891'
status: public
title: Generating Fast Indulgent Algorithms
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 51
year: '2012'
...
---
_id: '7748'
abstract:
- lang: eng
text: Female mate choice acts as an important evolutionary force, yet the influence
of the environment on both its expression and the selective pressures acting upon
it remains unknown. We found consistent heritable differences between females
in their choice of mate based on ornament size during a 25‐year study of a population
of collared flycatchers. However, the fitness consequences of mate choice were
dependent on environmental conditions experienced whilst breeding. Females breeding
with highly ornamented males experienced high relative fitness during dry summer
conditions, but low relative fitness during wetter years. Our results imply that
sexual selection within a population can be highly variable and dependent upon
the prevailing weather conditions experienced by individuals.
article_processing_charge: No
article_type: original
author:
- first_name: Matthew Richard
full_name: Robinson, Matthew Richard
id: E5D42276-F5DA-11E9-8E24-6303E6697425
last_name: Robinson
orcid: 0000-0001-8982-8813
- first_name: G.
full_name: Sander van Doorn, G.
last_name: Sander van Doorn
- first_name: Lars
full_name: Gustafsson, Lars
last_name: Gustafsson
- first_name: Anna
full_name: Qvarnström, Anna
last_name: Qvarnström
citation:
ama: Robinson MR, Sander van Doorn G, Gustafsson L, Qvarnström A. Environment-dependent
selection on mate choice in a natural population of birds. Ecology Letters.
2012;15(6):611-618. doi:10.1111/j.1461-0248.2012.01780.x
apa: Robinson, M. R., Sander van Doorn, G., Gustafsson, L., & Qvarnström, A.
(2012). Environment-dependent selection on mate choice in a natural population
of birds. Ecology Letters. Wiley. https://doi.org/10.1111/j.1461-0248.2012.01780.x
chicago: Robinson, Matthew Richard, G. Sander van Doorn, Lars Gustafsson, and Anna
Qvarnström. “Environment-Dependent Selection on Mate Choice in a Natural Population
of Birds.” Ecology Letters. Wiley, 2012. https://doi.org/10.1111/j.1461-0248.2012.01780.x.
ieee: M. R. Robinson, G. Sander van Doorn, L. Gustafsson, and A. Qvarnström, “Environment-dependent
selection on mate choice in a natural population of birds,” Ecology Letters,
vol. 15, no. 6. Wiley, pp. 611–618, 2012.
ista: Robinson MR, Sander van Doorn G, Gustafsson L, Qvarnström A. 2012. Environment-dependent
selection on mate choice in a natural population of birds. Ecology Letters. 15(6),
611–618.
mla: Robinson, Matthew Richard, et al. “Environment-Dependent Selection on Mate
Choice in a Natural Population of Birds.” Ecology Letters, vol. 15, no.
6, Wiley, 2012, pp. 611–18, doi:10.1111/j.1461-0248.2012.01780.x.
short: M.R. Robinson, G. Sander van Doorn, L. Gustafsson, A. Qvarnström, Ecology
Letters 15 (2012) 611–618.
date_created: 2020-04-30T11:01:07Z
date_published: 2012-06-01T00:00:00Z
date_updated: 2021-01-12T08:15:15Z
day: '01'
doi: 10.1111/j.1461-0248.2012.01780.x
extern: '1'
intvolume: ' 15'
issue: '6'
language:
- iso: eng
month: '06'
oa_version: None
page: 611-618
publication: Ecology Letters
publication_identifier:
issn:
- 1461-023X
publication_status: published
publisher: Wiley
quality_controlled: '1'
status: public
title: Environment-dependent selection on mate choice in a natural population of birds
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 15
year: '2012'
...
---
_id: '7749'
abstract:
- lang: eng
text: Although studies on laboratory species and natural populations of vertebrates
have shown reproduction to impair later performance, little is known of the age‐specific
associations between reproduction and survival, and how such findings apply to
the ageing of large, long‐lived species. Herein we develop a framework to examine
population‐level patterns of reproduction and survival across lifespan in long‐lived
organisms, and decompose those changes into individual‐level effects, and the
effects of age‐specific trade‐offs between fitness components. We apply this to
an extensive longitudinal dataset on female semi‐captive Asian timber elephants
(Elephas maximus) and report the first evidence of age‐specific fitness declines
that are driven by age‐specific associations between fitness components in a long‐lived
mammal. Associations between reproduction and survival are positive in early life,
but negative in later life with up to 71% of later‐life survival declines associated
with investing in the production of offspring within this population of this critically
endangered species.
article_processing_charge: No
article_type: original
author:
- first_name: Matthew Richard
full_name: Robinson, Matthew Richard
id: E5D42276-F5DA-11E9-8E24-6303E6697425
last_name: Robinson
orcid: 0000-0001-8982-8813
- first_name: Khyne U
full_name: Mar, Khyne U
last_name: Mar
- first_name: Virpi
full_name: Lummaa, Virpi
last_name: Lummaa
citation:
ama: Robinson MR, Mar KU, Lummaa V. Senescence and age-specific trade-offs between
reproduction and survival in female Asian elephants. Ecology Letters. 2012;15(3):260-266.
doi:10.1111/j.1461-0248.2011.01735.x
apa: Robinson, M. R., Mar, K. U., & Lummaa, V. (2012). Senescence and age-specific
trade-offs between reproduction and survival in female Asian elephants. Ecology
Letters. Wiley. https://doi.org/10.1111/j.1461-0248.2011.01735.x
chicago: Robinson, Matthew Richard, Khyne U Mar, and Virpi Lummaa. “Senescence and
Age-Specific Trade-Offs between Reproduction and Survival in Female Asian Elephants.”
Ecology Letters. Wiley, 2012. https://doi.org/10.1111/j.1461-0248.2011.01735.x.
ieee: M. R. Robinson, K. U. Mar, and V. Lummaa, “Senescence and age-specific trade-offs
between reproduction and survival in female Asian elephants,” Ecology Letters,
vol. 15, no. 3. Wiley, pp. 260–266, 2012.
ista: Robinson MR, Mar KU, Lummaa V. 2012. Senescence and age-specific trade-offs
between reproduction and survival in female Asian elephants. Ecology Letters.
15(3), 260–266.
mla: Robinson, Matthew Richard, et al. “Senescence and Age-Specific Trade-Offs between
Reproduction and Survival in Female Asian Elephants.” Ecology Letters,
vol. 15, no. 3, Wiley, 2012, pp. 260–66, doi:10.1111/j.1461-0248.2011.01735.x.
short: M.R. Robinson, K.U. Mar, V. Lummaa, Ecology Letters 15 (2012) 260–266.
date_created: 2020-04-30T11:01:26Z
date_published: 2012-03-01T00:00:00Z
date_updated: 2021-01-12T08:15:16Z
day: '01'
doi: 10.1111/j.1461-0248.2011.01735.x
extern: '1'
intvolume: ' 15'
issue: '3'
language:
- iso: eng
month: '03'
oa_version: None
page: 260-266
publication: Ecology Letters
publication_identifier:
issn:
- 1461-023X
publication_status: published
publisher: Wiley
quality_controlled: '1'
status: public
title: Senescence and age-specific trade-offs between reproduction and survival in
female Asian elephants
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 15
year: '2012'
...
---
_id: '7776'
abstract:
- lang: eng
text: We present an analysis of finite-size effects in jammed packings of N soft,
frictionless spheres at zero temperature. There is a 1/N correction to the discrete
jump in the contact number at the transition so that jammed packings exist only
above isostaticity. As a result, the canonical power-law scalings of the contact
number and elastic moduli break down at low pressure. These quantities exhibit
scaling collapse with a nontrivial scaling function, demonstrating that the jamming
transition can be considered a phase transition. Scaling is achieved as a function
of N in both two and three dimensions, indicating an upper critical dimension
of 2.
article_number: '095704'
article_processing_charge: No
article_type: original
author:
- first_name: Carl Peter
full_name: Goodrich, Carl Peter
id: EB352CD2-F68A-11E9-89C5-A432E6697425
last_name: Goodrich
orcid: 0000-0002-1307-5074
- first_name: Andrea J.
full_name: Liu, Andrea J.
last_name: Liu
- first_name: Sidney R.
full_name: Nagel, Sidney R.
last_name: Nagel
citation:
ama: Goodrich CP, Liu AJ, Nagel SR. Finite-size scaling at the jamming transition.
Physical Review Letters. 2012;109(9). doi:10.1103/physrevlett.109.095704
apa: Goodrich, C. P., Liu, A. J., & Nagel, S. R. (2012). Finite-size scaling
at the jamming transition. Physical Review Letters. American Physical Society.
https://doi.org/10.1103/physrevlett.109.095704
chicago: Goodrich, Carl Peter, Andrea J. Liu, and Sidney R. Nagel. “Finite-Size
Scaling at the Jamming Transition.” Physical Review Letters. American Physical
Society, 2012. https://doi.org/10.1103/physrevlett.109.095704.
ieee: C. P. Goodrich, A. J. Liu, and S. R. Nagel, “Finite-size scaling at the jamming
transition,” Physical Review Letters, vol. 109, no. 9. American Physical
Society, 2012.
ista: Goodrich CP, Liu AJ, Nagel SR. 2012. Finite-size scaling at the jamming transition.
Physical Review Letters. 109(9), 095704.
mla: Goodrich, Carl Peter, et al. “Finite-Size Scaling at the Jamming Transition.”
Physical Review Letters, vol. 109, no. 9, 095704, American Physical Society,
2012, doi:10.1103/physrevlett.109.095704.
short: C.P. Goodrich, A.J. Liu, S.R. Nagel, Physical Review Letters 109 (2012).
date_created: 2020-04-30T11:44:12Z
date_published: 2012-08-27T00:00:00Z
date_updated: 2021-01-12T08:15:27Z
day: '27'
doi: 10.1103/physrevlett.109.095704
extern: '1'
intvolume: ' 109'
issue: '9'
language:
- iso: eng
month: '08'
oa_version: None
publication: Physical Review Letters
publication_identifier:
issn:
- 0031-9007
- 1079-7114
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
status: public
title: Finite-size scaling at the jamming transition
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 109
year: '2012'
...
---
_id: '801'
abstract:
- lang: eng
text: Fungal cell walls frequently contain a polymer of mannose and galactose called
galactomannan. In the pathogenic filamentous fungus Aspergillus fumigatus, this
polysaccharide is made of a linear mannan backbone with side chains of galactofuran
and is anchored to the plasma membrane via a glycosylphosphatidylinositol or is
covalently linked to the cell wall. To date, the biosynthesis and significance
of this polysaccharide are unknown. The present data demonstrate that deletion
of the Golgi UDP-galactofuranose transporter GlfB or the GDP-mannose transporter
GmtA leads to the absence of galactofuran or galactomannan, respectively. This
indicates that the biosynthesis of galactomannan probably occurs in the lumen
of the Golgi apparatus and thus contrasts with the biosynthesis of other fungal
cell wall polysaccharides studied to date that takes place at the plasma membrane.
Transglycosylation of galactomannan from the membrane to the cell wall is hypothesized
because both the cell wall-bound and membrane-bound polysaccharide forms are affected
in the generated mutants. Considering the severe growth defect of the A. fumigatus
GmtA-deficient mutant, proving this paradigm might provide new targets for antifungal
therapy.
acknowledgement: This work was supported by the Deutsche Forschungsgemeinschaft.
article_processing_charge: No
article_type: original
author:
- first_name: Jakob
full_name: Engel, Jakob
last_name: Engel
- first_name: Philipp S
full_name: Schmalhorst, Philipp S
id: 309D50DA-F248-11E8-B48F-1D18A9856A87
last_name: Schmalhorst
orcid: 0000-0002-5795-0133
- first_name: Françoise
full_name: Routier, Françoise
last_name: Routier
citation:
ama: Engel J, Schmalhorst PS, Routier F. Biosynthesis of the fungal cell wall polysaccharide
galactomannan requires intraluminal GDP-mannose. Journal of Biological Chemistry.
2012;287(53):44418-44424. doi:10.1074/jbc.M112.398321
apa: Engel, J., Schmalhorst, P. S., & Routier, F. (2012). Biosynthesis of the
fungal cell wall polysaccharide galactomannan requires intraluminal GDP-mannose.
Journal of Biological Chemistry. American Society for Biochemistry and
Molecular Biology. https://doi.org/10.1074/jbc.M112.398321
chicago: Engel, Jakob, Philipp S Schmalhorst, and Françoise Routier. “Biosynthesis
of the Fungal Cell Wall Polysaccharide Galactomannan Requires Intraluminal GDP-Mannose.”
Journal of Biological Chemistry. American Society for Biochemistry and
Molecular Biology, 2012. https://doi.org/10.1074/jbc.M112.398321.
ieee: J. Engel, P. S. Schmalhorst, and F. Routier, “Biosynthesis of the fungal cell
wall polysaccharide galactomannan requires intraluminal GDP-mannose,” Journal
of Biological Chemistry, vol. 287, no. 53. American Society for Biochemistry
and Molecular Biology, pp. 44418–44424, 2012.
ista: Engel J, Schmalhorst PS, Routier F. 2012. Biosynthesis of the fungal cell
wall polysaccharide galactomannan requires intraluminal GDP-mannose. Journal of
Biological Chemistry. 287(53), 44418–44424.
mla: Engel, Jakob, et al. “Biosynthesis of the Fungal Cell Wall Polysaccharide Galactomannan
Requires Intraluminal GDP-Mannose.” Journal of Biological Chemistry, vol.
287, no. 53, American Society for Biochemistry and Molecular Biology, 2012, pp.
44418–24, doi:10.1074/jbc.M112.398321.
short: J. Engel, P.S. Schmalhorst, F. Routier, Journal of Biological Chemistry 287
(2012) 44418–44424.
date_created: 2018-12-11T11:48:34Z
date_published: 2012-12-28T00:00:00Z
date_updated: 2022-03-21T07:57:14Z
day: '28'
doi: 10.1074/jbc.M112.398321
extern: '1'
external_id:
pmid:
- '23139423'
intvolume: ' 287'
issue: '53'
language:
- iso: eng
month: '12'
oa_version: None
page: 44418 - 44424
pmid: 1
publication: Journal of Biological Chemistry
publication_status: published
publisher: American Society for Biochemistry and Molecular Biology
publist_id: '6852'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Biosynthesis of the fungal cell wall polysaccharide galactomannan requires
intraluminal GDP-mannose
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 287
year: '2012'
...
---
_id: '8024'
abstract:
- lang: eng
text: In dynamical models of cortical networks, the recurrent connectivity can amplify
the input given to the network in two distinct ways. One is induced by the presence
of near-critical eigenvalues in the connectivity matrix W, producing large but
slow activity fluctuations along the corresponding eigenvectors (dynamical slowing).
The other relies on W not being normal, which allows the network activity to make
large but fast excursions along specific directions. Here we investigate the trade-off
between non-normal amplification and dynamical slowing in the spontaneous activity
of large random neuronal networks composed of excitatory and inhibitory neurons.
We use a Schur decomposition of W to separate the two amplification mechanisms.
Assuming linear stochastic dynamics, we derive an exact expression for the expected
amount of purely non-normal amplification. We find that amplification is very
limited if dynamical slowing must be kept weak. We conclude that, to achieve strong
transient amplification with little slowing, the connectivity must be structured.
We show that unidirectional connections between neurons of the same type together
with reciprocal connections between neurons of different types, allow for amplification
already in the fast dynamical regime. Finally, our results also shed light on
the differences between balanced networks in which inhibition exactly cancels
excitation and those where inhibition dominates.
article_number: '011909'
article_processing_charge: No
article_type: original
author:
- first_name: Guillaume
full_name: Hennequin, Guillaume
last_name: Hennequin
- first_name: Tim P
full_name: Vogels, Tim P
id: CB6FF8D2-008F-11EA-8E08-2637E6697425
last_name: Vogels
orcid: 0000-0003-3295-6181
- first_name: Wulfram
full_name: Gerstner, Wulfram
last_name: Gerstner
citation:
ama: Hennequin G, Vogels TP, Gerstner W. Non-normal amplification in random balanced
neuronal networks. Physical Review E. 2012;86(1). doi:10.1103/physreve.86.011909
apa: Hennequin, G., Vogels, T. P., & Gerstner, W. (2012). Non-normal amplification
in random balanced neuronal networks. Physical Review E. American Physical
Society. https://doi.org/10.1103/physreve.86.011909
chicago: Hennequin, Guillaume, Tim P Vogels, and Wulfram Gerstner. “Non-Normal Amplification
in Random Balanced Neuronal Networks.” Physical Review E. American Physical
Society, 2012. https://doi.org/10.1103/physreve.86.011909.
ieee: G. Hennequin, T. P. Vogels, and W. Gerstner, “Non-normal amplification in
random balanced neuronal networks,” Physical Review E, vol. 86, no. 1.
American Physical Society, 2012.
ista: Hennequin G, Vogels TP, Gerstner W. 2012. Non-normal amplification in random
balanced neuronal networks. Physical Review E. 86(1), 011909.
mla: Hennequin, Guillaume, et al. “Non-Normal Amplification in Random Balanced Neuronal
Networks.” Physical Review E, vol. 86, no. 1, 011909, American Physical
Society, 2012, doi:10.1103/physreve.86.011909.
short: G. Hennequin, T.P. Vogels, W. Gerstner, Physical Review E 86 (2012).
date_created: 2020-06-25T13:09:06Z
date_published: 2012-06-11T00:00:00Z
date_updated: 2021-01-12T08:16:35Z
day: '11'
doi: 10.1103/physreve.86.011909
extern: '1'
external_id:
pmid:
- '23005454'
intvolume: ' 86'
issue: '1'
language:
- iso: eng
month: '06'
oa_version: None
pmid: 1
publication: Physical Review E
publication_identifier:
eisbn:
- 1550-2376
issn:
- 1539-3755
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
status: public
title: Non-normal amplification in random balanced neuronal networks
type: journal_article
user_id: D865714E-FA4E-11E9-B85B-F5C5E5697425
volume: 86
year: '2012'
...
---
_id: '808'
abstract:
- lang: eng
text: Using correlated live-cell imaging and electron tomography we found that actin
branch junctions in protruding and treadmilling lamellipodia are not concentrated
at the front as previously supposed, but link actin filament subsets in which
there is a continuum of distances from a junction to the filament plus ends, for
up to at least 1 mm. When branch sites were observed closely spaced on the same
filament their separation was commonly a multiple of the actin helical repeat
of 36 nm. Image averaging of branch junctions in the tomograms yielded a model
for the in vivo branch at 2.9 nm resolution, which was comparable with that derived
for the in vitro actin- Arp2/3 complex. Lamellipodium initiation was monitored
in an intracellular wound-healing model and was found to involve branching from
the sides of actin filaments oriented parallel to the plasmalemma. Many filament
plus ends, presumably capped, terminated behind the lamellipodium tip and localized
on the dorsal and ventral surfaces of the actin network. These findings reveal
how branching events initiate and maintain a network of actin filaments of variable
length, and provide the first structural model of the branch junction in vivo.
A possible role of filament capping in generating the lamellipodium leaflet is
discussed and a mathematical model of protrusion is also presented.
acknowledgement: This work was supported by the Austrian Science Fund [projects FWF
I516-B09 and FWF P21292-B09 to J.V.S.]; the Vienna Science and Technology Fund [WWTF-grant
numbers MA 09-004 to J.V.S. and C.S], ZIT - The Technology Agency of the City of
Vienna [VSOE, CMCN to J.V.S. and G.P.R.]; the Deutsche Forschungsgemeinschaft [grant
number RO 2414/1-2 to K.R.]; the Daiko research foundation [grant number 9134 to
A.N.]; and a Grant-in-Aid for Scientific Research [S, grant number 20227008 to Y.M.]
and a Grant-in-Aid for Young Scientists [B, grant number 22770145 to A.N.] (B) from
The Ministry of Education, Culture, Sports, Science and Technology of the Japanese
Government. Deposited in PMC for immediate release. We thank Tibor Kulcsar for assistance
with graphics.
article_processing_charge: No
author:
- first_name: Marlene
full_name: Vinzenz, Marlene
last_name: Vinzenz
- first_name: Maria
full_name: Nemethova, Maria
id: 34E27F1C-F248-11E8-B48F-1D18A9856A87
last_name: Nemethova
- first_name: Florian
full_name: Schur, Florian
id: 48AD8942-F248-11E8-B48F-1D18A9856A87
last_name: Schur
orcid: 0000-0003-4790-8078
- first_name: Jan
full_name: Mueller, Jan
last_name: Mueller
- first_name: Akihiro
full_name: Narita, Akihiro
last_name: Narita
- first_name: Edit
full_name: Urban, Edit
last_name: Urban
- first_name: Christoph
full_name: Winkler, Christoph
last_name: Winkler
- first_name: Christian
full_name: Schmeiser, Christian
last_name: Schmeiser
- first_name: Stefan
full_name: Koestler, Stefan
last_name: Koestler
- first_name: Klemens
full_name: Rottner, Klemens
last_name: Rottner
- first_name: Guenter
full_name: Resch, Guenter
last_name: Resch
- first_name: Yuichiro
full_name: Maéda, Yuichiro
last_name: Maéda
- first_name: John
full_name: Small, John
last_name: Small
citation:
ama: Vinzenz M, Nemethova M, Schur FK, et al. Actin branching in the initiation
and maintenance of lamellipodia. Journal of Cell Science. 2012;125(11):2775-2785.
doi:10.1242/jcs.107623
apa: Vinzenz, M., Nemethova, M., Schur, F. K., Mueller, J., Narita, A., Urban, E.,
… Small, J. (2012). Actin branching in the initiation and maintenance of lamellipodia.
Journal of Cell Science. Company of Biologists. https://doi.org/10.1242/jcs.107623
chicago: Vinzenz, Marlene, Maria Nemethova, Florian KM Schur, Jan Mueller, Akihiro
Narita, Edit Urban, Christoph Winkler, et al. “Actin Branching in the Initiation
and Maintenance of Lamellipodia.” Journal of Cell Science. Company of Biologists,
2012. https://doi.org/10.1242/jcs.107623.
ieee: M. Vinzenz et al., “Actin branching in the initiation and maintenance
of lamellipodia,” Journal of Cell Science, vol. 125, no. 11. Company of
Biologists, pp. 2775–2785, 2012.
ista: Vinzenz M, Nemethova M, Schur FK, Mueller J, Narita A, Urban E, Winkler C,
Schmeiser C, Koestler S, Rottner K, Resch G, Maéda Y, Small J. 2012. Actin branching
in the initiation and maintenance of lamellipodia. Journal of Cell Science. 125(11),
2775–2785.
mla: Vinzenz, Marlene, et al. “Actin Branching in the Initiation and Maintenance
of Lamellipodia.” Journal of Cell Science, vol. 125, no. 11, Company of
Biologists, 2012, pp. 2775–85, doi:10.1242/jcs.107623.
short: M. Vinzenz, M. Nemethova, F.K. Schur, J. Mueller, A. Narita, E. Urban, C.
Winkler, C. Schmeiser, S. Koestler, K. Rottner, G. Resch, Y. Maéda, J. Small,
Journal of Cell Science 125 (2012) 2775–2785.
date_created: 2018-12-11T11:48:37Z
date_published: 2012-06-01T00:00:00Z
date_updated: 2025-09-30T08:23:31Z
day: '01'
ddc:
- '570'
doi: 10.1242/jcs.107623
extern: '1'
external_id:
isi:
- '000306705000022'
file:
- access_level: open_access
checksum: 2f59e15cc3a85bb500a9887cef2aab67
content_type: application/pdf
creator: kschuh
date_created: 2019-02-12T08:54:51Z
date_updated: 2020-07-14T12:48:09Z
file_id: '5956'
file_name: 2012_Biologists_Vinzenz.pdf
file_size: 3326073
relation: main_file
file_date_updated: 2020-07-14T12:48:09Z
has_accepted_license: '1'
intvolume: ' 125'
isi: 1
issue: '11'
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nc-sa/4.0/
month: '06'
oa: 1
oa_version: None
page: 2775 - 2785
publication: Journal of Cell Science
publication_status: published
publisher: Company of Biologists
publist_id: '6842'
quality_controlled: '1'
status: public
title: Actin branching in the initiation and maintenance of lamellipodia
tmp:
image: /images/cc_by_nc_sa.png
legal_code_url: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC
BY-NC-SA 4.0)
short: CC BY-NC-SA (4.0)
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 125
year: '2012'
...
---
_id: '8246'
abstract:
- lang: eng
text: The Staphylococcus aureus cell wall stress stimulon (CWSS) is activated by
cell envelope-targeting antibiotics or depletion of essential cell wall biosynthesis
enzymes. The functionally uncharacterized S. aureus LytR-CpsA-Psr (LCP) proteins,
MsrR, SA0908 and SA2103, all belong to the CWSS. Although not essential, deletion
of all three LCP proteins severely impairs cell division. We show here that VraSR-dependent
CWSS expression was up to 250-fold higher in single, double and triple LCP mutants
than in wild type S. aureus in the absence of external stress. The LCP triple
mutant was virtually depleted of wall teichoic acids (WTA), which could be restored
to different degrees by any of the single LCP proteins. Subinhibitory concentrations
of tunicamycin, which inhibits the first WTA synthesis enzyme TarO (TagO), could
partially complement the severe growth defect of the LCP triple mutant. Both of
the latter findings support a role for S. aureus LCP proteins in late WTA synthesis,
as in Bacillus subtilis where LCP proteins were recently proposed to transfer
WTA from lipid carriers to the cell wall peptidoglycan. Intrinsic activation of
the CWSS upon LCP deletion and the fact that LCP proteins were essential for WTA-loading
of the cell wall, highlight their important role(s) in S. aureus cell envelope
biogenesis.
article_processing_charge: No
article_type: original
author:
- first_name: Vanina
full_name: Dengler, Vanina
last_name: Dengler
- first_name: Patricia Stutzmann
full_name: Meier, Patricia Stutzmann
last_name: Meier
- first_name: Ronald
full_name: Heusser, Ronald
last_name: Heusser
- first_name: Peter
full_name: Kupferschmied, Peter
last_name: Kupferschmied
- first_name: Judit
full_name: Fazekas, Judit
id: 36432834-F248-11E8-B48F-1D18A9856A87
last_name: Fazekas
orcid: 0000-0002-8777-3502
- first_name: Sarah
full_name: Friebe, Sarah
last_name: Friebe
- first_name: Sibylle Burger
full_name: Staufer, Sibylle Burger
last_name: Staufer
- first_name: Paul A.
full_name: Majcherczyk, Paul A.
last_name: Majcherczyk
- first_name: Philippe
full_name: Moreillon, Philippe
last_name: Moreillon
- first_name: Brigitte
full_name: Berger-Bächi, Brigitte
last_name: Berger-Bächi
- first_name: Nadine
full_name: McCallum, Nadine
last_name: McCallum
citation:
ama: Dengler V, Meier PS, Heusser R, et al. Deletion of hypothetical wall teichoic
acid ligases in Staphylococcus aureus activates the cell wall stress response.
FEMS Microbiology Letters. 2012;333(2):109-120. doi:10.1111/j.1574-6968.2012.02603.x
apa: Dengler, V., Meier, P. S., Heusser, R., Kupferschmied, P., Singer, J., Friebe,
S., … McCallum, N. (2012). Deletion of hypothetical wall teichoic acid ligases
in Staphylococcus aureus activates the cell wall stress response. FEMS Microbiology
Letters. Oxford University Press. https://doi.org/10.1111/j.1574-6968.2012.02603.x
chicago: Dengler, Vanina, Patricia Stutzmann Meier, Ronald Heusser, Peter Kupferschmied,
Judit Singer, Sarah Friebe, Sibylle Burger Staufer, et al. “Deletion of Hypothetical
Wall Teichoic Acid Ligases in Staphylococcus Aureus Activates the Cell Wall Stress
Response.” FEMS Microbiology Letters. Oxford University Press, 2012. https://doi.org/10.1111/j.1574-6968.2012.02603.x.
ieee: V. Dengler et al., “Deletion of hypothetical wall teichoic acid ligases
in Staphylococcus aureus activates the cell wall stress response,” FEMS Microbiology
Letters, vol. 333, no. 2. Oxford University Press, pp. 109–120, 2012.
ista: Dengler V, Meier PS, Heusser R, Kupferschmied P, Singer J, Friebe S, Staufer
SB, Majcherczyk PA, Moreillon P, Berger-Bächi B, McCallum N. 2012. Deletion of
hypothetical wall teichoic acid ligases in Staphylococcus aureus activates the
cell wall stress response. FEMS Microbiology Letters. 333(2), 109–120.
mla: Dengler, Vanina, et al. “Deletion of Hypothetical Wall Teichoic Acid Ligases
in Staphylococcus Aureus Activates the Cell Wall Stress Response.” FEMS Microbiology
Letters, vol. 333, no. 2, Oxford University Press, 2012, pp. 109–20, doi:10.1111/j.1574-6968.2012.02603.x.
short: V. Dengler, P.S. Meier, R. Heusser, P. Kupferschmied, J. Singer, S. Friebe,
S.B. Staufer, P.A. Majcherczyk, P. Moreillon, B. Berger-Bächi, N. McCallum, FEMS
Microbiology Letters 333 (2012) 109–120.
date_created: 2020-08-10T11:54:47Z
date_published: 2012-08-01T00:00:00Z
date_updated: 2021-01-12T08:17:43Z
day: '01'
doi: 10.1111/j.1574-6968.2012.02603.x
extern: '1'
external_id:
pmid:
- '22640011'
intvolume: ' 333'
issue: '2'
language:
- iso: eng
month: '08'
oa_version: None
page: 109-120
pmid: 1
publication: FEMS Microbiology Letters
publication_identifier:
issn:
- 0378-1097
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
status: public
title: Deletion of hypothetical wall teichoic acid ligases in Staphylococcus aureus
activates the cell wall stress response
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 333
year: '2012'
...