---
_id: '10373'
abstract:
- lang: eng
text: 'Electric charges are conserved. The same would be expected to hold for magnetic
charges, yet magnetic monopoles have never been observed. It is therefore surprising
that the laws of nonequilibrium thermodynamics, combined with Maxwell’s equations,
suggest that colloidal particles heated or cooled in certain polar or paramagnetic
solvents may behave as if they carry an electric/magnetic charge. Here, we present
numerical simulations that show that the field distribution around a pair of such
heated/cooled colloidal particles agrees quantitatively with the theoretical predictions
for a pair of oppositely charged electric or magnetic monopoles. However, in other
respects, the nonequilibrium colloidal particles do not behave as monopoles: They
cannot be moved by a homogeneous applied field. The numerical evidence for the
monopole-like fields around heated/cooled colloidal particles is crucial because
the experimental and numerical determination of forces between such colloidal
particles would be complicated by the presence of other effects, such as thermophoresis.'
acknowledgement: P.W. acknowledges many invaluable discussions with Martin Neumann,
Chao Zhang, Michiel Sprik, Aleks Reinhardt, Carl Pölking, and Tine Curk. We acknowledge
financial support from the Austrian Academy of Sciences through a doctoral (DOC)
fellowship (to P.W.), the Austrian Science Fund (FWF) within the Spezialforschungsbereich
Vienna Computational Materials Laboratory (Project F41) (C.D.), and the European
Union Early Training Network NANOTRANS (Grant 674979 to D. Frenkel). The results
presented here have been achieved in part using the Vienna Scientific Cluster.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Peter
full_name: Wirnsberger, Peter
last_name: Wirnsberger
- first_name: Domagoj
full_name: Fijan, Domagoj
last_name: Fijan
- first_name: Roger A.
full_name: Lightwood, Roger A.
last_name: Lightwood
- first_name: Anđela
full_name: Šarić, Anđela
id: bf63d406-f056-11eb-b41d-f263a6566d8b
last_name: Šarić
orcid: 0000-0002-7854-2139
- first_name: Christoph
full_name: Dellago, Christoph
last_name: Dellago
- first_name: Daan
full_name: Frenkel, Daan
last_name: Frenkel
citation:
ama: Wirnsberger P, Fijan D, Lightwood RA, Šarić A, Dellago C, Frenkel D. Numerical
evidence for thermally induced monopoles. Proceedings of the National Academy
of Sciences. 2017;114(19):4911-4914. doi:10.1073/pnas.1621494114
apa: Wirnsberger, P., Fijan, D., Lightwood, R. A., Šarić, A., Dellago, C., &
Frenkel, D. (2017). Numerical evidence for thermally induced monopoles. Proceedings
of the National Academy of Sciences. National Academy of Sciences. https://doi.org/10.1073/pnas.1621494114
chicago: Wirnsberger, Peter, Domagoj Fijan, Roger A. Lightwood, Anđela Šarić, Christoph
Dellago, and Daan Frenkel. “Numerical Evidence for Thermally Induced Monopoles.”
Proceedings of the National Academy of Sciences. National Academy of Sciences,
2017. https://doi.org/10.1073/pnas.1621494114.
ieee: P. Wirnsberger, D. Fijan, R. A. Lightwood, A. Šarić, C. Dellago, and D. Frenkel,
“Numerical evidence for thermally induced monopoles,” Proceedings of the National
Academy of Sciences, vol. 114, no. 19. National Academy of Sciences, pp. 4911–4914,
2017.
ista: Wirnsberger P, Fijan D, Lightwood RA, Šarić A, Dellago C, Frenkel D. 2017.
Numerical evidence for thermally induced monopoles. Proceedings of the National
Academy of Sciences. 114(19), 4911–4914.
mla: Wirnsberger, Peter, et al. “Numerical Evidence for Thermally Induced Monopoles.”
Proceedings of the National Academy of Sciences, vol. 114, no. 19, National
Academy of Sciences, 2017, pp. 4911–14, doi:10.1073/pnas.1621494114.
short: P. Wirnsberger, D. Fijan, R.A. Lightwood, A. Šarić, C. Dellago, D. Frenkel,
Proceedings of the National Academy of Sciences 114 (2017) 4911–4914.
date_created: 2021-11-29T09:28:24Z
date_published: 2017-04-24T00:00:00Z
date_updated: 2021-11-29T09:59:12Z
day: '24'
doi: 10.1073/pnas.1621494114
extern: '1'
external_id:
arxiv:
- '1610.06840'
pmid:
- '28439003'
intvolume: ' 114'
issue: '19'
keyword:
- multidisciplinary
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.pnas.org/content/114/19/4911
month: '04'
oa: 1
oa_version: Published Version
page: 4911-4914
pmid: 1
publication: Proceedings of the National Academy of Sciences
publication_identifier:
eissn:
- 1091-6490
issn:
- 0027-8424
publication_status: published
publisher: National Academy of Sciences
quality_controlled: '1'
scopus_import: '1'
status: public
title: Numerical evidence for thermally induced monopoles
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 114
year: '2017'
...
---
_id: '10374'
abstract:
- lang: eng
text: The formation of filaments from naturally occurring protein molecules is a
process at the core of a range of functional and aberrant biological phenomena,
such as the assembly of the cytoskeleton or the appearance of aggregates in Alzheimer's
disease. The macroscopic behaviour associated with such processes is remarkably
diverse, ranging from simple nucleated growth to highly cooperative processes
with a well-defined lagtime. Thus, conventionally, different molecular mechanisms
have been used to explain the self-assembly of different proteins. Here we show
that this range of behaviour can be quantitatively captured by a single unifying
Petri net that describes filamentous growth in terms of aggregate number and aggregate
mass concentrations. By considering general features associated with a particular
network connectivity, we are able to establish directly the rate-determining steps
of the overall aggregation reaction from the system's scaling behaviour. We illustrate
the power of this framework on a range of different experimental and simulated
aggregating systems. The approach is general and will be applicable to any future
extensions of the reaction network of filamentous self-assembly.
acknowledgement: The research leading to these results has received funding from the
European Research Council under the European Union's Seventh Framework Programme
(FP7/2007-2013) through the ERC grant PhysProt (agreement no. 337969) (SL, TPJK),
Sidney Sussex College Cambridge (GM), the Frances and Augusta Newman Foundation
(TPJK), the Biotechnology and Biological Science Research Council (TPJK), the Swedish
Research Council (SL), the Academy of Medical Sciences (AŠ), Wellcome Trust (AŠ),
and the Cambridge Centre for Misfolding Diseases (CMD, TPJK, MV).
article_processing_charge: No
article_type: original
author:
- first_name: Georg
full_name: Meisl, Georg
last_name: Meisl
- first_name: Luke
full_name: Rajah, Luke
last_name: Rajah
- first_name: Samuel A. I.
full_name: Cohen, Samuel A. I.
last_name: Cohen
- first_name: Manuela
full_name: Pfammatter, Manuela
last_name: Pfammatter
- first_name: Anđela
full_name: Šarić, Anđela
id: bf63d406-f056-11eb-b41d-f263a6566d8b
last_name: Šarić
orcid: 0000-0002-7854-2139
- first_name: Erik
full_name: Hellstrand, Erik
last_name: Hellstrand
- first_name: Alexander K.
full_name: Buell, Alexander K.
last_name: Buell
- first_name: Adriano
full_name: Aguzzi, Adriano
last_name: Aguzzi
- first_name: Sara
full_name: Linse, Sara
last_name: Linse
- first_name: Michele
full_name: Vendruscolo, Michele
last_name: Vendruscolo
- first_name: Christopher M.
full_name: Dobson, Christopher M.
last_name: Dobson
- first_name: Tuomas P. J.
full_name: Knowles, Tuomas P. J.
last_name: Knowles
citation:
ama: Meisl G, Rajah L, Cohen SAI, et al. Scaling behaviour and rate-determining
steps in filamentous self-assembly. Chemical Science. 2017;8(10):7087-7097.
doi:10.1039/c7sc01965c
apa: Meisl, G., Rajah, L., Cohen, S. A. I., Pfammatter, M., Šarić, A., Hellstrand,
E., … Knowles, T. P. J. (2017). Scaling behaviour and rate-determining steps in
filamentous self-assembly. Chemical Science. Royal Society of Chemistry.
https://doi.org/10.1039/c7sc01965c
chicago: Meisl, Georg, Luke Rajah, Samuel A. I. Cohen, Manuela Pfammatter, Anđela
Šarić, Erik Hellstrand, Alexander K. Buell, et al. “Scaling Behaviour and Rate-Determining
Steps in Filamentous Self-Assembly.” Chemical Science. Royal Society of
Chemistry, 2017. https://doi.org/10.1039/c7sc01965c.
ieee: G. Meisl et al., “Scaling behaviour and rate-determining steps in filamentous
self-assembly,” Chemical Science, vol. 8, no. 10. Royal Society of Chemistry,
pp. 7087–7097, 2017.
ista: Meisl G, Rajah L, Cohen SAI, Pfammatter M, Šarić A, Hellstrand E, Buell AK,
Aguzzi A, Linse S, Vendruscolo M, Dobson CM, Knowles TPJ. 2017. Scaling behaviour
and rate-determining steps in filamentous self-assembly. Chemical Science. 8(10),
7087–7097.
mla: Meisl, Georg, et al. “Scaling Behaviour and Rate-Determining Steps in Filamentous
Self-Assembly.” Chemical Science, vol. 8, no. 10, Royal Society of Chemistry,
2017, pp. 7087–97, doi:10.1039/c7sc01965c.
short: G. Meisl, L. Rajah, S.A.I. Cohen, M. Pfammatter, A. Šarić, E. Hellstrand,
A.K. Buell, A. Aguzzi, S. Linse, M. Vendruscolo, C.M. Dobson, T.P.J. Knowles,
Chemical Science 8 (2017) 7087–7097.
date_created: 2021-11-29T09:29:31Z
date_published: 2017-08-31T00:00:00Z
date_updated: 2021-11-29T10:00:00Z
day: '31'
ddc:
- '540'
doi: 10.1039/c7sc01965c
extern: '1'
external_id:
pmid:
- '29147538'
intvolume: ' 8'
issue: '10'
keyword:
- general chemistry
language:
- iso: eng
license: https://creativecommons.org/licenses/by-nc/3.0/
main_file_link:
- open_access: '1'
url: https://pubs.rsc.org/en/content/articlelanding/2017/SC/C7SC01965C
month: '08'
oa: 1
oa_version: Published Version
page: 7087-7097
pmid: 1
publication: Chemical Science
publication_identifier:
eissn:
- 2041-6539
issn:
- 2041-6520
publication_status: published
publisher: Royal Society of Chemistry
quality_controlled: '1'
scopus_import: '1'
status: public
title: Scaling behaviour and rate-determining steps in filamentous self-assembly
tmp:
image: /images/cc_by_nc.png
legal_code_url: https://creativecommons.org/licenses/by-nc/3.0/legalcode
name: Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)
short: CC BY-NC (3.0)
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 8
year: '2017'
...
---
_id: '10375'
abstract:
- lang: eng
text: 'Cellular membranes exhibit a large variety of shapes, strongly coupled to
their function. Many biological processes involve dynamic reshaping of membranes,
usually mediated by proteins. This interaction works both ways: while proteins
influence the membrane shape, the membrane shape affects the interactions between
the proteins. To study these membrane-mediated interactions on closed and anisotropically
curved membranes, we use colloids adhered to ellipsoidal membrane vesicles as
a model system. We find that two particles on a closed system always attract each
other, and tend to align with the direction of largest curvature. Multiple particles
form arcs, or, at large enough numbers, a complete ring surrounding the vesicle
in its equatorial plane. The resulting vesicle shape resembles a snowman. Our
results indicate that these physical interactions on membranes with anisotropic
shapes can be exploited by cells to drive macromolecules to preferred regions
of cellular or intracellular membranes, and utilized to initiate dynamic processes
such as cell division. The same principle could be used to find the midplane of
an artificial vesicle, as a first step towards dividing it into two equal parts.'
acknowledgement: This work was supported by the Netherlands Organisation for Scientific
Research (NWO/OCW), as part of the Frontiers of Nanoscience program.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Afshin
full_name: Vahid, Afshin
last_name: Vahid
- first_name: Anđela
full_name: Šarić, Anđela
id: bf63d406-f056-11eb-b41d-f263a6566d8b
last_name: Šarić
orcid: 0000-0002-7854-2139
- first_name: Timon
full_name: Idema, Timon
last_name: Idema
citation:
ama: Vahid A, Šarić A, Idema T. Curvature variation controls particle aggregation
on fluid vesicles. Soft Matter. 2017;13(28):4924-4930. doi:10.1039/c7sm00433h
apa: Vahid, A., Šarić, A., & Idema, T. (2017). Curvature variation controls
particle aggregation on fluid vesicles. Soft Matter. Royal Society of Chemistry.
https://doi.org/10.1039/c7sm00433h
chicago: Vahid, Afshin, Anđela Šarić, and Timon Idema. “Curvature Variation Controls
Particle Aggregation on Fluid Vesicles.” Soft Matter. Royal Society of
Chemistry, 2017. https://doi.org/10.1039/c7sm00433h.
ieee: A. Vahid, A. Šarić, and T. Idema, “Curvature variation controls particle aggregation
on fluid vesicles,” Soft Matter, vol. 13, no. 28. Royal Society of Chemistry,
pp. 4924–4930, 2017.
ista: Vahid A, Šarić A, Idema T. 2017. Curvature variation controls particle aggregation
on fluid vesicles. Soft Matter. 13(28), 4924–4930.
mla: Vahid, Afshin, et al. “Curvature Variation Controls Particle Aggregation on
Fluid Vesicles.” Soft Matter, vol. 13, no. 28, Royal Society of Chemistry,
2017, pp. 4924–30, doi:10.1039/c7sm00433h.
short: A. Vahid, A. Šarić, T. Idema, Soft Matter 13 (2017) 4924–4930.
date_created: 2021-11-29T10:00:39Z
date_published: 2017-06-15T00:00:00Z
date_updated: 2021-11-29T10:33:36Z
day: '15'
doi: 10.1039/c7sm00433h
extern: '1'
external_id:
arxiv:
- '1703.00776'
pmid:
- '28677712'
intvolume: ' 13'
issue: '28'
keyword:
- condensed matter physics
- general chemistry
language:
- iso: eng
license: https://creativecommons.org/licenses/by/3.0/
main_file_link:
- open_access: '1'
url: https://pubs.rsc.org/en/content/articlelanding/2017/SM/C7SM00433H
month: '06'
oa: 1
oa_version: Published Version
page: 4924-4930
pmid: 1
publication: Soft Matter
publication_identifier:
eissn:
- 1744-6848
issn:
- 1744-683X
publication_status: published
publisher: Royal Society of Chemistry
quality_controlled: '1'
scopus_import: '1'
status: public
title: Curvature variation controls particle aggregation on fluid vesicles
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/3.0/legalcode
name: Creative Commons Attribution 3.0 Unported (CC BY 3.0)
short: CC BY (3.0)
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 13
year: '2017'
...
---
_id: '10416'
abstract:
- lang: eng
text: 'A fundamental algorithmic problem at the heart of static analysis is Dyck
reachability. The input is a graph where the edges are labeled with different
types of opening and closing parentheses, and the reachability information is
computed via paths whose parentheses are properly matched. We present new results
for Dyck reachability problems with applications to alias analysis and data-dependence
analysis. Our main contributions, that include improved upper bounds as well as
lower bounds that establish optimality guarantees, are as follows: First, we consider
Dyck reachability on bidirected graphs, which is the standard way of performing
field-sensitive points-to analysis. Given a bidirected graph with n nodes and
m edges, we present: (i) an algorithm with worst-case running time O(m + n · α(n)),
where α(n) is the inverse Ackermann function, improving the previously known O(n2)
time bound; (ii) a matching lower bound that shows that our algorithm is optimal
wrt to worst-case complexity; and (iii) an optimal average-case upper bound of
O(m) time, improving the previously known O(m · logn) bound. Second, we consider
the problem of context-sensitive data-dependence analysis, where the task is to
obtain analysis summaries of library code in the presence of callbacks. Our algorithm
preprocesses libraries in almost linear time, after which the contribution of
the library in the complexity of the client analysis is only linear, and only
wrt the number of call sites. Third, we prove that combinatorial algorithms for
Dyck reachability on general graphs with truly sub-cubic bounds cannot be obtained
without obtaining sub-cubic combinatorial algorithms for Boolean Matrix Multiplication,
which is a long-standing open problem. Thus we establish that the existing combinatorial
algorithms for Dyck reachability are (conditionally) optimal for general graphs.
We also show that the same hardness holds for graphs of constant treewidth. Finally,
we provide a prototype implementation of our algorithms for both alias analysis
and data-dependence analysis. Our experimental evaluation demonstrates that the
new algorithms significantly outperform all existing methods on the two problems,
over real-world benchmarks.'
acknowledgement: "The research was partly supported by Austrian Science Fund (FWF)
Grant No P23499-N23, FWF NFN Grant No S11407-N23 (RiSE/SHiNE), and ERC Start grant
(279307: Graph Games).\r\n"
article_number: '30'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Krishnendu
full_name: Chatterjee, Krishnendu
id: 2E5DCA20-F248-11E8-B48F-1D18A9856A87
last_name: Chatterjee
orcid: 0000-0002-4561-241X
- first_name: Bhavya
full_name: Choudhary, Bhavya
last_name: Choudhary
- first_name: Andreas
full_name: Pavlogiannis, Andreas
id: 49704004-F248-11E8-B48F-1D18A9856A87
last_name: Pavlogiannis
orcid: 0000-0002-8943-0722
citation:
ama: Chatterjee K, Choudhary B, Pavlogiannis A. Optimal Dyck reachability for data-dependence
and Alias analysis. Proceedings of the ACM on Programming Languages. 2017;2(POPL).
doi:10.1145/3158118
apa: 'Chatterjee, K., Choudhary, B., & Pavlogiannis, A. (2017). Optimal Dyck
reachability for data-dependence and Alias analysis. Proceedings of the ACM
on Programming Languages. Los Angeles, CA, United States: Association for
Computing Machinery. https://doi.org/10.1145/3158118'
chicago: Chatterjee, Krishnendu, Bhavya Choudhary, and Andreas Pavlogiannis. “Optimal
Dyck Reachability for Data-Dependence and Alias Analysis.” Proceedings of the
ACM on Programming Languages. Association for Computing Machinery, 2017. https://doi.org/10.1145/3158118.
ieee: K. Chatterjee, B. Choudhary, and A. Pavlogiannis, “Optimal Dyck reachability
for data-dependence and Alias analysis,” Proceedings of the ACM on Programming
Languages, vol. 2, no. POPL. Association for Computing Machinery, 2017.
ista: Chatterjee K, Choudhary B, Pavlogiannis A. 2017. Optimal Dyck reachability
for data-dependence and Alias analysis. Proceedings of the ACM on Programming
Languages. 2(POPL), 30.
mla: Chatterjee, Krishnendu, et al. “Optimal Dyck Reachability for Data-Dependence
and Alias Analysis.” Proceedings of the ACM on Programming Languages, vol.
2, no. POPL, 30, Association for Computing Machinery, 2017, doi:10.1145/3158118.
short: K. Chatterjee, B. Choudhary, A. Pavlogiannis, Proceedings of the ACM on Programming
Languages 2 (2017).
conference:
end_date: 2018-01-13
location: Los Angeles, CA, United States
name: 'POPL: Programming Languages'
start_date: 2018-01-07
corr_author: '1'
date_created: 2021-12-05T23:01:48Z
date_published: 2017-12-27T00:00:00Z
date_updated: 2025-04-15T07:26:20Z
day: '27'
ddc:
- '000'
department:
- _id: KrCh
doi: 10.1145/3158118
ec_funded: 1
external_id:
arxiv:
- '1910.00241'
file:
- access_level: open_access
checksum: faa3f7b3fe8aab84b50ed805c26a0ee5
content_type: application/pdf
creator: cchlebak
date_created: 2021-12-07T08:06:28Z
date_updated: 2021-12-07T08:06:28Z
file_id: '10421'
file_name: 2017_ACMProgLang_Chatterjee.pdf
file_size: 460188
relation: main_file
success: 1
file_date_updated: 2021-12-07T08:06:28Z
has_accepted_license: '1'
intvolume: ' 2'
issue: POPL
language:
- iso: eng
license: https://creativecommons.org/licenses/by/4.0/
month: '12'
oa: 1
oa_version: Published Version
project:
- _id: 2581B60A-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '279307'
name: 'Quantitative Graph Games: Theory and Applications'
- _id: 2584A770-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: P 23499-N23
name: Modern Graph Algorithmic Techniques in Formal Verification
- _id: 25832EC2-B435-11E9-9278-68D0E5697425
call_identifier: FWF
grant_number: S 11407_N23
name: Rigorous Systems Engineering
publication: Proceedings of the ACM on Programming Languages
publication_identifier:
eissn:
- 2475-1421
publication_status: published
publisher: Association for Computing Machinery
quality_controlled: '1'
related_material:
record:
- id: '5455'
relation: earlier_version
status: public
scopus_import: '1'
status: public
title: Optimal Dyck reachability for data-dependence and Alias analysis
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 2
year: '2017'
...
---
_id: '10418'
abstract:
- lang: eng
text: We present a new proof rule for proving almost-sure termination of probabilistic
programs, including those that contain demonic non-determinism. An important question
for a probabilistic program is whether the probability mass of all its diverging
runs is zero, that is that it terminates "almost surely". Proving that can be
hard, and this paper presents a new method for doing so. It applies directly to
the program's source code, even if the program contains demonic choice. Like others,
we use variant functions (a.k.a. "super-martingales") that are real-valued and
decrease randomly on each loop iteration; but our key innovation is that the amount
as well as the probability of the decrease are parametric. We prove the soundness
of the new rule, indicate where its applicability goes beyond existing rules,
and explain its connection to classical results on denumerable (non-demonic) Markov
chains.
acknowledgement: "McIver and Morgan are grateful to David Basin and the Information
Security Group at ETH Zürich for hosting a six-month stay in Switzerland, during
part of which this work began. And thanks particularly to Andreas Lochbihler, who
shared with us the probabilistic termination problem that led to it. They acknowledge
the support of ARC grant DP140101119. Part of this work was carried out during the
Workshop on Probabilistic Programming Semantics\r\nat McGill University’s Bellairs
Research Institute on Barbados organised by Alexandra Silva and\r\nPrakash Panangaden.
Kaminski and Katoen are grateful to Sebastian Junges for spotting a flaw in §5.4."
article_number: '33'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Annabelle
full_name: Mciver, Annabelle
last_name: Mciver
- first_name: Carroll
full_name: Morgan, Carroll
last_name: Morgan
- first_name: Benjamin Lucien
full_name: Kaminski, Benjamin Lucien
last_name: Kaminski
- first_name: Joost P
full_name: Katoen, Joost P
id: 4524F760-F248-11E8-B48F-1D18A9856A87
last_name: Katoen
citation:
ama: Mciver A, Morgan C, Kaminski BL, Katoen JP. A new proof rule for almost-sure
termination. Proceedings of the ACM on Programming Languages. 2017;2(POPL).
doi:10.1145/3158121
apa: 'Mciver, A., Morgan, C., Kaminski, B. L., & Katoen, J. P. (2017). A new
proof rule for almost-sure termination. Proceedings of the ACM on Programming
Languages. Los Angeles, CA, United States: Association for Computing Machinery.
https://doi.org/10.1145/3158121'
chicago: Mciver, Annabelle, Carroll Morgan, Benjamin Lucien Kaminski, and Joost
P Katoen. “A New Proof Rule for Almost-Sure Termination.” Proceedings of the
ACM on Programming Languages. Association for Computing Machinery, 2017. https://doi.org/10.1145/3158121.
ieee: A. Mciver, C. Morgan, B. L. Kaminski, and J. P. Katoen, “A new proof rule
for almost-sure termination,” Proceedings of the ACM on Programming Languages,
vol. 2, no. POPL. Association for Computing Machinery, 2017.
ista: Mciver A, Morgan C, Kaminski BL, Katoen JP. 2017. A new proof rule for almost-sure
termination. Proceedings of the ACM on Programming Languages. 2(POPL), 33.
mla: Mciver, Annabelle, et al. “A New Proof Rule for Almost-Sure Termination.” Proceedings
of the ACM on Programming Languages, vol. 2, no. POPL, 33, Association for
Computing Machinery, 2017, doi:10.1145/3158121.
short: A. Mciver, C. Morgan, B.L. Kaminski, J.P. Katoen, Proceedings of the ACM
on Programming Languages 2 (2017).
conference:
end_date: 2018-01-13
location: Los Angeles, CA, United States
name: 'POPL: Programming Languages'
start_date: 2018-01-07
corr_author: '1'
date_created: 2021-12-05T23:01:49Z
date_published: 2017-12-07T00:00:00Z
date_updated: 2024-10-09T21:01:14Z
day: '07'
department:
- _id: KrCh
- _id: ToHe
doi: 10.1145/3158121
external_id:
arxiv:
- '1711.03588'
intvolume: ' 2'
issue: POPL
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://dl.acm.org/doi/10.1145/3158121
month: '12'
oa: 1
oa_version: Published Version
publication: Proceedings of the ACM on Programming Languages
publication_identifier:
eissn:
- 2475-1421
publication_status: published
publisher: Association for Computing Machinery
quality_controlled: '1'
scopus_import: '1'
status: public
title: A new proof rule for almost-sure termination
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 2
year: '2017'
...
---
DOAJ_listed: '1'
OA_place: publisher
OA_type: gold
_id: '21098'
abstract:
- lang: eng
text: The growth of crystals of aromatic compounds from water much depends on the
nature of the water solubilizing functions that they carry. Rationalizing crystallization
from water, and structure elucidation, of aromatic molecular and supramolecular
systems is of general value across various fields of chemistry. Taking helical
aromatic foldamers as a test case, we have validated several short polar side
chains as efficient substituents to provide both solubility in, and crystal growth
ability from, water. New 8-amino-2-quinolinecarboxylic acids bearing charged or
neutral aminomethyl, carboxymethyl, sulfonic acid, or bis(hydroxymethyl)-methoxy
side chains in position 4 or 5, were prepared on a multi gram scale. Fmoc protection
of the main chain amine and suitable protections of the side chains ensured compatibility
with solid phase synthesis. One tetrameric and five octameric oligoamides displaying
these side chains were synthesized and shown to be soluble in water. In all cases
but one, crystals were obtained using the hanging drop method, thus validating
the initial design principle to combine polarity and rigidity. The only case that
resisted crystallization appeared to be due to exceedingly high water solubility
endowed by eight sulfonic acid functions. The neutral side chain did provide crystal
growth ability from water but contributed poorly to solubility.
article_processing_charge: No
article_type: original
author:
- first_name: Xiaobo
full_name: Hu, Xiaobo
last_name: Hu
- first_name: Simon J.
full_name: Dawson, Simon J.
last_name: Dawson
- first_name: Pradeep K
full_name: Mandal, Pradeep K
id: 6a3def15-d4b4-11ef-9fa9-a24c1f545ec3
last_name: Mandal
orcid: 0000-0001-5996-956X
- first_name: Xavier
full_name: de Hatten, Xavier
last_name: de Hatten
- first_name: Benoit
full_name: Baptiste, Benoit
last_name: Baptiste
- first_name: Ivan
full_name: Huc, Ivan
last_name: Huc
citation:
ama: 'Hu X, Dawson SJ, Mandal PK, de Hatten X, Baptiste B, Huc I. Optimizing side
chains for crystal growth from water: a case study of aromatic amide foldamers.
Chemical Science. 2017;8(5):3741-3749. doi:10.1039/c7sc00430c'
apa: 'Hu, X., Dawson, S. J., Mandal, P. K., de Hatten, X., Baptiste, B., & Huc,
I. (2017). Optimizing side chains for crystal growth from water: a case study
of aromatic amide foldamers. Chemical Science. Royal Society of Chemistry.
https://doi.org/10.1039/c7sc00430c'
chicago: 'Hu, Xiaobo, Simon J. Dawson, Pradeep K Mandal, Xavier de Hatten, Benoit
Baptiste, and Ivan Huc. “Optimizing Side Chains for Crystal Growth from Water:
A Case Study of Aromatic Amide Foldamers.” Chemical Science. Royal Society
of Chemistry, 2017. https://doi.org/10.1039/c7sc00430c.'
ieee: 'X. Hu, S. J. Dawson, P. K. Mandal, X. de Hatten, B. Baptiste, and I. Huc,
“Optimizing side chains for crystal growth from water: a case study of aromatic
amide foldamers,” Chemical Science, vol. 8, no. 5. Royal Society of Chemistry,
pp. 3741–3749, 2017.'
ista: 'Hu X, Dawson SJ, Mandal PK, de Hatten X, Baptiste B, Huc I. 2017. Optimizing
side chains for crystal growth from water: a case study of aromatic amide foldamers.
Chemical Science. 8(5), 3741–3749.'
mla: 'Hu, Xiaobo, et al. “Optimizing Side Chains for Crystal Growth from Water:
A Case Study of Aromatic Amide Foldamers.” Chemical Science, vol. 8, no.
5, Royal Society of Chemistry, 2017, pp. 3741–49, doi:10.1039/c7sc00430c.'
short: X. Hu, S.J. Dawson, P.K. Mandal, X. de Hatten, B. Baptiste, I. Huc, Chemical
Science 8 (2017) 3741–3749.
date_created: 2026-01-29T21:31:01Z
date_published: 2017-03-08T00:00:00Z
date_updated: 2026-02-23T09:53:30Z
day: '08'
doi: 10.1039/c7sc00430c
extern: '1'
has_accepted_license: '1'
intvolume: ' 8'
issue: '5'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1039/C7SC00430C
month: '03'
oa: 1
oa_version: Published Version
page: 3741-3749
publication: Chemical Science
publication_identifier:
eissn:
- 2041-6539
issn:
- 2041-6520
publication_status: published
publisher: Royal Society of Chemistry
quality_controlled: '1'
status: public
title: 'Optimizing side chains for crystal growth from water: a case study of aromatic
amide foldamers'
tmp:
image: /images/cc_by_nc.png
legal_code_url: https://creativecommons.org/licenses/by-nc/3.0/legalcode
name: Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)
short: CC BY-NC (3.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 8
year: '2017'
...
---
OA_type: closed access
_id: '21156'
abstract:
- lang: eng
text: The crystal structure of the tetradecanucleotide d(CCCCGGTACCGGGG)2 has previously
been reported as an A-type double helix at a resolution of 2.5 Å in space group
P41. Here, the structure of this sequence was determined at a significantly higher
resolution of 1.65 Å in space group P41212. The differences in crystal packing
between the former and latter are described. The crystallographic asymmetric unit
consists of one tetradecanucleotide duplex that spans more than one full turn
of the A-helix. This structure allowed the unambiguous identification of solvent
interactions.
article_processing_charge: No
article_type: original
author:
- first_name: Selvam
full_name: Karthik, Selvam
last_name: Karthik
- first_name: Arunachalam
full_name: Thirugnanasambandam, Arunachalam
last_name: Thirugnanasambandam
- first_name: Pradeep K
full_name: Mandal, Pradeep K
id: 6a3def15-d4b4-11ef-9fa9-a24c1f545ec3
last_name: Mandal
orcid: 0000-0001-5996-956X
- first_name: Namasivayam
full_name: Gautham, Namasivayam
last_name: Gautham
citation:
ama: Karthik S, Thirugnanasambandam A, Mandal PK, Gautham N. Crystal structure of
d(CCGGGGTACCCCGG)2 at 1.4 Å resolution. Acta Crystallographica Section F Structural
Biology Communications. 2017;73(5):259-265. doi:10.1107/s2053230x17004770
apa: Karthik, S., Thirugnanasambandam, A., Mandal, P. K., & Gautham, N. (2017).
Crystal structure of d(CCGGGGTACCCCGG)2 at 1.4 Å resolution. Acta Crystallographica
Section F Structural Biology Communications. International Union of Crystallography.
https://doi.org/10.1107/s2053230x17004770
chicago: Karthik, Selvam, Arunachalam Thirugnanasambandam, Pradeep K Mandal, and
Namasivayam Gautham. “Crystal Structure of d(CCGGGGTACCCCGG)2 at 1.4 Å Resolution.”
Acta Crystallographica Section F Structural Biology Communications. International
Union of Crystallography, 2017. https://doi.org/10.1107/s2053230x17004770.
ieee: S. Karthik, A. Thirugnanasambandam, P. K. Mandal, and N. Gautham, “Crystal
structure of d(CCGGGGTACCCCGG)2 at 1.4 Å resolution,” Acta Crystallographica
Section F Structural Biology Communications, vol. 73, no. 5. International
Union of Crystallography, pp. 259–265, 2017.
ista: Karthik S, Thirugnanasambandam A, Mandal PK, Gautham N. 2017. Crystal structure
of d(CCGGGGTACCCCGG)2 at 1.4 Å resolution. Acta Crystallographica Section F Structural
Biology Communications. 73(5), 259–265.
mla: Karthik, Selvam, et al. “Crystal Structure of d(CCGGGGTACCCCGG)2 at 1.4 Å Resolution.”
Acta Crystallographica Section F Structural Biology Communications, vol.
73, no. 5, International Union of Crystallography, 2017, pp. 259–65, doi:10.1107/s2053230x17004770.
short: S. Karthik, A. Thirugnanasambandam, P.K. Mandal, N. Gautham, Acta Crystallographica
Section F Structural Biology Communications 73 (2017) 259–265.
date_created: 2026-02-06T12:26:15Z
date_published: 2017-05-01T00:00:00Z
date_updated: 2026-02-23T08:23:34Z
day: '01'
doi: 10.1107/s2053230x17004770
extern: '1'
has_accepted_license: '1'
intvolume: ' 73'
issue: '5'
language:
- iso: eng
month: '05'
oa_version: None
page: 259-265
publication: Acta Crystallographica Section F Structural Biology Communications
publication_identifier:
issn:
- 2053-230X
publication_status: published
publisher: International Union of Crystallography
quality_controlled: '1'
status: public
title: Crystal structure of d(CCGGGGTACCCCGG)2 at 1.4 Å resolution
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 73
year: '2017'
...
---
OA_type: closed access
_id: '21157'
abstract:
- lang: eng
text: We present here a comparison of three different X-ray crystal structures of
DNA tetradecamer sequence d(CCCGGGTACCCGGG)2 all at about 1.7 Å resolution. The
sequence was designed as an attempt to form a DNA four-way junction with A-type
helical arms. However, in the presence of zinc, magnesium, and in the absence
of any metal ion, it does not take up the junction structure, but forms an A-type
double helix. This allowed us to study possible conformational changes in the
double helix due to the presence of metal ions. Upon addition of the zinc ion,
there is a change in the space group from P41212 to P41. The overall conformation
of the duplex remains the same. There are small changes in the interaction of
the metal ions with the DNA. In the zinc-bound structure, there are two zinc ions
that show direct interaction with the N7 atoms of terminal G13 bases at either
end of the molecule. There are small changes in the interhelical contacts. The
consequence of these differences is to break some of the symmetry and change the
space group.
article_processing_charge: No
article_type: original
author:
- first_name: S.
full_name: Karthik, S.
last_name: Karthik
- first_name: A.
full_name: Thirugnanasambandam, A.
last_name: Thirugnanasambandam
- first_name: Pradeep K
full_name: Mandal, Pradeep K
id: 6a3def15-d4b4-11ef-9fa9-a24c1f545ec3
last_name: Mandal
orcid: 0000-0001-5996-956X
- first_name: N.
full_name: Gautham, N.
last_name: Gautham
citation:
ama: Karthik S, Thirugnanasambandam A, Mandal PK, Gautham N. Comparison of X-ray
crystal structures of a tetradecamer sequence d(CCCGGGTACCCGGG)2 at 1.7 Å resolution.
Nucleosides, Nucleotides and Nucleic Acids. 2017;36(5):343-354. doi:10.1080/15257770.2017.1287378
apa: Karthik, S., Thirugnanasambandam, A., Mandal, P. K., & Gautham, N. (2017).
Comparison of X-ray crystal structures of a tetradecamer sequence d(CCCGGGTACCCGGG)2
at 1.7 Å resolution. Nucleosides, Nucleotides and Nucleic Acids. Informa
UK Limited. https://doi.org/10.1080/15257770.2017.1287378
chicago: Karthik, S., A. Thirugnanasambandam, Pradeep K Mandal, and N. Gautham.
“Comparison of X-Ray Crystal Structures of a Tetradecamer Sequence d(CCCGGGTACCCGGG)2
at 1.7 Å Resolution.” Nucleosides, Nucleotides and Nucleic Acids. Informa
UK Limited, 2017. https://doi.org/10.1080/15257770.2017.1287378.
ieee: S. Karthik, A. Thirugnanasambandam, P. K. Mandal, and N. Gautham, “Comparison
of X-ray crystal structures of a tetradecamer sequence d(CCCGGGTACCCGGG)2 at 1.7 Å
resolution,” Nucleosides, Nucleotides and Nucleic Acids, vol. 36, no. 5.
Informa UK Limited, pp. 343–354, 2017.
ista: Karthik S, Thirugnanasambandam A, Mandal PK, Gautham N. 2017. Comparison of
X-ray crystal structures of a tetradecamer sequence d(CCCGGGTACCCGGG)2 at 1.7 Å
resolution. Nucleosides, Nucleotides and Nucleic Acids. 36(5), 343–354.
mla: Karthik, S., et al. “Comparison of X-Ray Crystal Structures of a Tetradecamer
Sequence d(CCCGGGTACCCGGG)2 at 1.7 Å Resolution.” Nucleosides, Nucleotides
and Nucleic Acids, vol. 36, no. 5, Informa UK Limited, 2017, pp. 343–54, doi:10.1080/15257770.2017.1287378.
short: S. Karthik, A. Thirugnanasambandam, P.K. Mandal, N. Gautham, Nucleosides,
Nucleotides and Nucleic Acids 36 (2017) 343–354.
date_created: 2026-02-06T12:27:54Z
date_published: 2017-04-07T00:00:00Z
date_updated: 2026-02-20T07:13:25Z
day: '07'
doi: 10.1080/15257770.2017.1287378
extern: '1'
external_id:
pmid:
- '28387634'
has_accepted_license: '1'
intvolume: ' 36'
issue: '5'
language:
- iso: eng
month: '04'
oa_version: None
page: 343-354
pmid: 1
publication: Nucleosides, Nucleotides and Nucleic Acids
publication_identifier:
eissn:
- 1532-2335
issn:
- 1525-7770
publication_status: published
publisher: Informa UK Limited
quality_controlled: '1'
status: public
title: Comparison of X-ray crystal structures of a tetradecamer sequence d(CCCGGGTACCCGGG)2
at 1.7 Å resolution
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 36
year: '2017'
...
---
_id: '256'
abstract:
- lang: eng
text: We show that a non-singular integral form of degree d is soluble over the
integers if and only if it is soluble over ℝ and over ℚp for all primes p, provided
that the form has at least (d - 1/2 √d)2d variables. This improves on a longstanding
result of Birch.
acknowledgement: While working on this paper the authors were supported by the Leverhulme
Trust and ERC grant 306457.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Timothy D
full_name: Browning, Timothy D
id: 35827D50-F248-11E8-B48F-1D18A9856A87
last_name: Browning
orcid: 0000-0002-8314-0177
- first_name: Sean
full_name: Prendiville, Sean
last_name: Prendiville
citation:
ama: Browning TD, Prendiville S. Improvements in Birch’s theorem on forms in many
variables. Journal fur die Reine und Angewandte Mathematik. 2017;2017(731):122.
doi:10.1515/crelle-2014-0122
apa: Browning, T. D., & Prendiville, S. (2017). Improvements in Birch’s theorem
on forms in many variables. Journal Fur Die Reine Und Angewandte Mathematik.
Walter de Gruyter. https://doi.org/10.1515/crelle-2014-0122
chicago: Browning, Timothy D, and Sean Prendiville. “Improvements in Birch’s Theorem
on Forms in Many Variables.” Journal Fur Die Reine Und Angewandte Mathematik.
Walter de Gruyter, 2017. https://doi.org/10.1515/crelle-2014-0122.
ieee: T. D. Browning and S. Prendiville, “Improvements in Birch’s theorem on forms
in many variables,” Journal fur die Reine und Angewandte Mathematik, vol.
2017, no. 731. Walter de Gruyter, p. 122, 2017.
ista: Browning TD, Prendiville S. 2017. Improvements in Birch’s theorem on forms
in many variables. Journal fur die Reine und Angewandte Mathematik. 2017(731),
122.
mla: Browning, Timothy D., and Sean Prendiville. “Improvements in Birch’s Theorem
on Forms in Many Variables.” Journal Fur Die Reine Und Angewandte Mathematik,
vol. 2017, no. 731, Walter de Gruyter, 2017, p. 122, doi:10.1515/crelle-2014-0122.
short: T.D. Browning, S. Prendiville, Journal Fur Die Reine Und Angewandte Mathematik
2017 (2017) 122.
corr_author: '1'
date_created: 2018-12-11T11:45:28Z
date_published: 2017-10-01T00:00:00Z
date_updated: 2024-10-09T20:58:16Z
day: '01'
doi: 10.1515/crelle-2014-0122
extern: '1'
external_id:
arxiv:
- '1402.4489'
intvolume: ' 2017'
issue: '731'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1402.4489
month: '10'
oa: 1
oa_version: Preprint
page: '122'
publication: Journal fur die Reine und Angewandte Mathematik
publication_identifier:
issn:
- 0075-4102
publication_status: published
publisher: Walter de Gruyter
publist_id: '7646'
quality_controlled: '1'
related_material:
record:
- id: '271'
relation: earlier_version
status: public
status: public
title: Improvements in Birch's theorem on forms in many variables
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 2017
year: '2017'
...
---
_id: '169'
abstract:
- lang: eng
text: We show that a twisted variant of Linnik’s conjecture on sums of Kloosterman
sums leads to an optimal covering exponent for S3.
article_processing_charge: No
arxiv: 1
author:
- first_name: Timothy D
full_name: Browning, Timothy D
id: 35827D50-F248-11E8-B48F-1D18A9856A87
last_name: Browning
orcid: 0000-0002-8314-0177
- first_name: Vinay
full_name: Kumaraswamy, Vinay
last_name: Kumaraswamy
- first_name: Rapael
full_name: Steiner, Rapael
last_name: Steiner
citation:
ama: Browning TD, Kumaraswamy V, Steiner R. Twisted Linnik implies optimal covering
exponent for S3. International Mathematics Research Notices. 2017. doi:10.1093/imrn/rnx116
apa: Browning, T. D., Kumaraswamy, V., & Steiner, R. (2017). Twisted Linnik
implies optimal covering exponent for S3. International Mathematics Research
Notices. Oxford University Press. https://doi.org/10.1093/imrn/rnx116
chicago: Browning, Timothy D, Vinay Kumaraswamy, and Rapael Steiner. “Twisted Linnik
Implies Optimal Covering Exponent for S3.” International Mathematics Research
Notices. Oxford University Press, 2017. https://doi.org/10.1093/imrn/rnx116.
ieee: T. D. Browning, V. Kumaraswamy, and R. Steiner, “Twisted Linnik implies optimal
covering exponent for S3,” International Mathematics Research Notices.
Oxford University Press, 2017.
ista: Browning TD, Kumaraswamy V, Steiner R. 2017. Twisted Linnik implies optimal
covering exponent for S3. International Mathematics Research Notices.
mla: Browning, Timothy D., et al. “Twisted Linnik Implies Optimal Covering Exponent
for S3.” International Mathematics Research Notices, Oxford University
Press, 2017, doi:10.1093/imrn/rnx116.
short: T.D. Browning, V. Kumaraswamy, R. Steiner, International Mathematics Research
Notices (2017).
date_created: 2018-12-11T11:44:59Z
date_published: 2017-06-19T00:00:00Z
date_updated: 2021-01-12T06:52:32Z
day: '19'
doi: 10.1093/imrn/rnx116
extern: '1'
external_id:
arxiv:
- '1609.06097'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1609.06097
month: '06'
oa: 1
oa_version: None
publication: International Mathematics Research Notices
publication_status: published
publisher: Oxford University Press
publist_id: '7752'
quality_controlled: '1'
status: public
title: Twisted Linnik implies optimal covering exponent for S3
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2017'
...
---
_id: '172'
abstract:
- lang: eng
text: We study strong approximation for some algebraic varieties over ℚ which are
defined using norm forms. This allows us to confirm a special case of a conjecture
due to Harpaz and Wittenberg.
article_processing_charge: No
arxiv: 1
author:
- first_name: Timothy D
full_name: Browning, Timothy D
id: 35827D50-F248-11E8-B48F-1D18A9856A87
last_name: Browning
orcid: 0000-0002-8314-0177
- first_name: Damaris
full_name: Schindler, Damaris
last_name: Schindler
citation:
ama: Browning TD, Schindler D. Strong approximation and a conjecture of Harpaz and
Wittenberg. International Mathematics Research Notices. 2017. doi:10.1093/imrn/rnx252
apa: Browning, T. D., & Schindler, D. (2017). Strong approximation and a conjecture
of Harpaz and Wittenberg. International Mathematics Research Notices. Oxford
University Press. https://doi.org/10.1093/imrn/rnx252
chicago: Browning, Timothy D, and Damaris Schindler. “Strong Approximation and a
Conjecture of Harpaz and Wittenberg.” International Mathematics Research Notices.
Oxford University Press, 2017. https://doi.org/10.1093/imrn/rnx252.
ieee: T. D. Browning and D. Schindler, “Strong approximation and a conjecture of
Harpaz and Wittenberg,” International Mathematics Research Notices. Oxford
University Press, 2017.
ista: Browning TD, Schindler D. 2017. Strong approximation and a conjecture of Harpaz
and Wittenberg. International Mathematics Research Notices.
mla: Browning, Timothy D., and Damaris Schindler. “Strong Approximation and a Conjecture
of Harpaz and Wittenberg.” International Mathematics Research Notices,
Oxford University Press, 2017, doi:10.1093/imrn/rnx252.
short: T.D. Browning, D. Schindler, International Mathematics Research Notices (2017).
date_created: 2018-12-11T11:45:00Z
date_published: 2017-10-30T00:00:00Z
date_updated: 2021-01-12T06:52:45Z
day: '30'
doi: 10.1093/imrn/rnx252
extern: '1'
external_id:
arxiv:
- '1509.07744'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1509.07744
month: '10'
oa: 1
oa_version: None
publication: International Mathematics Research Notices
publication_status: published
publisher: Oxford University Press
publist_id: '7749'
quality_controlled: '1'
status: public
title: Strong approximation and a conjecture of Harpaz and Wittenberg
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
year: '2017'
...
---
_id: '17616'
abstract:
- lang: eng
text: The optical and UV emission from sub-parsec massive black hole binaries (MBHBs)
in active galactic nuclei (AGNs) is believed to vary periodically, on time-scales
comparable to the binary's orbital time. If driven by accretion rate fluctuations,
the variability could be isotropic. If dominated by relativistic Doppler modulation,
the variability should instead be anisotropic, resembling a rotating forward-beamed
lighthouse. We consider the infrared (IR) reverberation of either type of periodic
emission by pc-scale circumbinary dust tori. We predict the phase and amplitude
of IR variability as a function of the ratio of dust light crossing time to the
source variability period, and of the torus inclination and opening angle. We
enumerate several differences between the isotropic and anisotropic cases. Interestingly,
for a nearly face-on binary with an inclined dust torus, the Doppler boost can
produce IR variability without any observable optical/UV variability. Such orphan-IR
variability would have been missed in optical searches for periodic AGNs. We apply
our models to time-domain WISE IR data from the MBHB candidate PG 1302−102 and
find consistency with dust reverberation by both isotropically emitting and Doppler-boosted
sources in the shorter wavelength W1–W2 (2.8 → 5.3 μm) bands. We constrain the
dust torus to be thin (aspect ratio ∼ 0.1), with an inner radius at 1–5 pc. More
generally, our dust-echo models will aid in identifying new MBHB candidates, determining
their nature and constraining the physical properties of MBHBs and their dust
tori.
article_processing_charge: No
article_type: original
author:
- first_name: Daniel J.
full_name: D'Orazio, Daniel J.
last_name: D'Orazio
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: 'D’Orazio DJ, Haiman Z. Lighthouse in the dust: infrared echoes of periodic
emission from massive black hole binaries★. Monthly Notices of the Royal Astronomical
Society. 2017;470(1):1198-1217. doi:10.1093/mnras/stx1269'
apa: 'D’Orazio, D. J., & Haiman, Z. (2017). Lighthouse in the dust: infrared
echoes of periodic emission from massive black hole binaries★. Monthly Notices
of the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1093/mnras/stx1269'
chicago: 'D’Orazio, Daniel J., and Zoltán Haiman. “Lighthouse in the Dust: Infrared
Echoes of Periodic Emission from Massive Black Hole Binaries★.” Monthly Notices
of the Royal Astronomical Society. Oxford University Press, 2017. https://doi.org/10.1093/mnras/stx1269.'
ieee: 'D. J. D’Orazio and Z. Haiman, “Lighthouse in the dust: infrared echoes of
periodic emission from massive black hole binaries★,” Monthly Notices of the
Royal Astronomical Society, vol. 470, no. 1. Oxford University Press, pp.
1198–1217, 2017.'
ista: 'D’Orazio DJ, Haiman Z. 2017. Lighthouse in the dust: infrared echoes of periodic
emission from massive black hole binaries★. Monthly Notices of the Royal Astronomical
Society. 470(1), 1198–1217.'
mla: 'D’Orazio, Daniel J., and Zoltán Haiman. “Lighthouse in the Dust: Infrared
Echoes of Periodic Emission from Massive Black Hole Binaries★.” Monthly Notices
of the Royal Astronomical Society, vol. 470, no. 1, Oxford University Press,
2017, pp. 1198–217, doi:10.1093/mnras/stx1269.'
short: D.J. D’Orazio, Z. Haiman, Monthly Notices of the Royal Astronomical Society
470 (2017) 1198–1217.
date_created: 2024-09-05T13:32:36Z
date_published: 2017-05-23T00:00:00Z
date_updated: 2024-09-24T08:01:52Z
day: '23'
doi: 10.1093/mnras/stx1269
extern: '1'
intvolume: ' 470'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1093/mnras/stx1269
month: '05'
oa: 1
oa_version: Published Version
page: 1198-1217
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: 'Lighthouse in the dust: infrared echoes of periodic emission from massive
black hole binaries★'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 470
year: '2017'
...
---
_id: '17629'
abstract:
- lang: eng
text: We propose an observational test for gravitationally recoiling supermassive
black holes in active galactic nuclei, based on a positive correlation between
the velocities of black holes relative to their host galaxies, |Δv|, and their
obscuring dust column densities, Σdust, both measured along the line of sight.
Our findings using a set of toy models implemented to a Monte Carlo simulation
imply that models of the galactic centre and of recoil dynamics can be tested
by future observations of the potential Σdust–|Δv| correlation. We have also found
that the fraction of obscured quasars decreases with |Δv|, for which the predicted
trend can be compared to the observed fraction of type II quasars, and can further
test combinations of models we may implement.
article_processing_charge: No
article_type: original
author:
- first_name: P.
full_name: Raffai, P.
last_name: Raffai
- first_name: B.
full_name: Bécsy, B.
last_name: Bécsy
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: Z.
full_name: Frei, Z.
last_name: Frei
citation:
ama: Raffai P, Bécsy B, Haiman Z, Frei Z. A statistical method for detecting gravitational
recoils of supermassive black holes in active galactic nuclei. Proceedings
of the International Astronomical Union. 2017;12(S324):227-230. doi:10.1017/s1743921317000734
apa: Raffai, P., Bécsy, B., Haiman, Z., & Frei, Z. (2017). A statistical method
for detecting gravitational recoils of supermassive black holes in active galactic
nuclei. Proceedings of the International Astronomical Union. Cambridge
University Press. https://doi.org/10.1017/s1743921317000734
chicago: Raffai, P., B. Bécsy, Zoltán Haiman, and Z. Frei. “A Statistical Method
for Detecting Gravitational Recoils of Supermassive Black Holes in Active Galactic
Nuclei.” Proceedings of the International Astronomical Union. Cambridge
University Press, 2017. https://doi.org/10.1017/s1743921317000734.
ieee: P. Raffai, B. Bécsy, Z. Haiman, and Z. Frei, “A statistical method for detecting
gravitational recoils of supermassive black holes in active galactic nuclei,”
Proceedings of the International Astronomical Union, vol. 12, no. S324.
Cambridge University Press, pp. 227–230, 2017.
ista: Raffai P, Bécsy B, Haiman Z, Frei Z. 2017. A statistical method for detecting
gravitational recoils of supermassive black holes in active galactic nuclei. Proceedings
of the International Astronomical Union. 12(S324), 227–230.
mla: Raffai, P., et al. “A Statistical Method for Detecting Gravitational Recoils
of Supermassive Black Holes in Active Galactic Nuclei.” Proceedings of the
International Astronomical Union, vol. 12, no. S324, Cambridge University
Press, 2017, pp. 227–30, doi:10.1017/s1743921317000734.
short: P. Raffai, B. Bécsy, Z. Haiman, Z. Frei, Proceedings of the International
Astronomical Union 12 (2017) 227–230.
date_created: 2024-09-05T13:58:38Z
date_published: 2017-06-23T00:00:00Z
date_updated: 2024-09-24T09:30:29Z
day: '23'
doi: 10.1017/s1743921317000734
extern: '1'
intvolume: ' 12'
issue: S324
language:
- iso: eng
main_file_link:
- url: https://doi.org/10.1017/s1743921317000734
month: '06'
oa_version: None
page: 227-230
publication: Proceedings of the International Astronomical Union
publication_identifier:
issn:
- 1743-9213
- 1743-9221
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: A statistical method for detecting gravitational recoils of supermassive black
holes in active galactic nuclei
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 12
year: '2017'
...
---
_id: '17630'
abstract:
- lang: eng
text: In symmetric gravitating systems experiencing rapid mass-loss, particle orbits
change almost instantaneously, which can lead to the development of a sharply
contoured density profile, including singular caustics for collisionless systems.
This framework can be used to model a variety of dynamical systems, such as accretion
discs following a massive black hole merger and dwarf galaxies following violent
early star formation feedback. Particle interactions in the high-density peaks
seem a promising source of observable signatures of these mass-loss events (i.e.
a possible EM counterpart for black hole mergers or strong gamma-ray emission
from dark matter annihilation around young galaxies), because the interaction
rate depends on the square of the density. We study post-mass-loss density profiles,
both analytic and numerical, in idealized cases and present arguments and methods
to extend to any general system. An analytic derivation is presented for particles
on Keplerian orbits responding to a drop in the central mass. We argue that this
case, with initially circular orbits, gives the most sharply contoured profile
possible. We find that despite the presence of a set of singular caustics, the
total particle interaction rate is reduced compared to the unperturbed system;
this is a result of the overall expansion of the system dominating over the steep
caustics. Finally, we argue that this result holds more generally, and the loss
of central mass decreases the particle interaction rate in any physical system.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Zephyr
full_name: Penoyre, Zephyr
last_name: Penoyre
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: 'Penoyre Z, Haiman Z. A drop in the pond: The effect of rapid mass-loss on
the dynamics and interaction rate of collisionless particles. Monthly Notices
of the Royal Astronomical Society. 2017;473(1):498-512. doi:10.1093/mnras/stx2469'
apa: 'Penoyre, Z., & Haiman, Z. (2017). A drop in the pond: The effect of rapid
mass-loss on the dynamics and interaction rate of collisionless particles. Monthly
Notices of the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1093/mnras/stx2469'
chicago: 'Penoyre, Zephyr, and Zoltán Haiman. “A Drop in the Pond: The Effect of
Rapid Mass-Loss on the Dynamics and Interaction Rate of Collisionless Particles.”
Monthly Notices of the Royal Astronomical Society. Oxford University Press,
2017. https://doi.org/10.1093/mnras/stx2469.'
ieee: 'Z. Penoyre and Z. Haiman, “A drop in the pond: The effect of rapid mass-loss
on the dynamics and interaction rate of collisionless particles,” Monthly Notices
of the Royal Astronomical Society, vol. 473, no. 1. Oxford University Press,
pp. 498–512, 2017.'
ista: 'Penoyre Z, Haiman Z. 2017. A drop in the pond: The effect of rapid mass-loss
on the dynamics and interaction rate of collisionless particles. Monthly Notices
of the Royal Astronomical Society. 473(1), 498–512.'
mla: 'Penoyre, Zephyr, and Zoltán Haiman. “A Drop in the Pond: The Effect of Rapid
Mass-Loss on the Dynamics and Interaction Rate of Collisionless Particles.” Monthly
Notices of the Royal Astronomical Society, vol. 473, no. 1, Oxford University
Press, 2017, pp. 498–512, doi:10.1093/mnras/stx2469.'
short: Z. Penoyre, Z. Haiman, Monthly Notices of the Royal Astronomical Society
473 (2017) 498–512.
date_created: 2024-09-05T13:59:48Z
date_published: 2017-09-25T00:00:00Z
date_updated: 2024-09-24T09:48:08Z
day: '25'
doi: 10.1093/mnras/stx2469
extern: '1'
external_id:
arxiv:
- '1709.08640'
intvolume: ' 473'
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.1709.08640'
month: '09'
oa: 1
oa_version: Preprint
page: 498-512
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: 'A drop in the pond: The effect of rapid mass-loss on the dynamics and interaction
rate of collisionless particles'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 473
year: '2017'
...
---
_id: '17632'
abstract:
- lang: eng
text: 'We assess the contribution of dynamical hardening by direct three-body scattering
interactions to the rate of stellar-mass black hole binary (BHB) mergers in galactic
nuclei. We derive an analytic model for the single-binary encounter rate in a
nucleus with spherical and disc components hosting a super-massive black hole
(SMBH). We determine the total number of encounters NGW needed to harden a BHB
to the point that inspiral due to gravitational wave emission occurs before the
next three-body scattering event. This is done independently for both the spherical
and disc components. Using a Monte Carlo approach, we refine our calculations
for NGW to include gravitational wave emission between scattering events. For
astrophysically plausible models, we find that typically NGW ≲ 10. We find two
separate regimes for the efficient dynamical hardening of BHBs: (1) spherical
star clusters with high central densities, low-velocity dispersions, and no significant
Keplerian component and (2) migration traps in discs around SMBHs lacking any
significant spherical stellar component in the vicinity of the migration trap,
which is expected due to effective orbital inclination reduction of any spherical
population by the disc. We also find a weak correlation between the ratio of the
second-order velocity moment to velocity dispersion in galactic nuclei and the
rate of BHB mergers, where this ratio is a proxy for the ratio between the rotation-
and dispersion-supported components. Because discs enforce planar interactions
that are efficient in hardening BHBs, particularly in migration traps, they have
high merger rates that can contribute significantly to the rate of BHB mergers
detected by the advanced Laser Interferometer Gravitational-Wave Observatory.'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: N W C
full_name: Leigh, N W C
last_name: Leigh
- first_name: A M
full_name: Geller, A M
last_name: Geller
- first_name: B
full_name: McKernan, B
last_name: McKernan
- first_name: K E S
full_name: Ford, K E S
last_name: Ford
- first_name: M-M
full_name: Mac Low, M-M
last_name: Mac Low
- first_name: J
full_name: Bellovary, J
last_name: Bellovary
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: W
full_name: Lyra, W
last_name: Lyra
- first_name: J
full_name: Samsing, J
last_name: Samsing
- first_name: M
full_name: O'Dowd, M
last_name: O'Dowd
- first_name: B
full_name: Kocsis, B
last_name: Kocsis
- first_name: S
full_name: Endlich, S
last_name: Endlich
citation:
ama: Leigh NWC, Geller AM, McKernan B, et al. On the rate of black hole binary mergers
in galactic nuclei due to dynamical hardening. Monthly Notices of the Royal
Astronomical Society. 2017;474(4):5672-5683. doi:10.1093/mnras/stx3134
apa: Leigh, N. W. C., Geller, A. M., McKernan, B., Ford, K. E. S., Mac Low, M.-M.,
Bellovary, J., … Endlich, S. (2017). On the rate of black hole binary mergers
in galactic nuclei due to dynamical hardening. Monthly Notices of the Royal
Astronomical Society. Oxford University Press. https://doi.org/10.1093/mnras/stx3134
chicago: Leigh, N W C, A M Geller, B McKernan, K E S Ford, M-M Mac Low, J Bellovary,
Zoltán Haiman, et al. “On the Rate of Black Hole Binary Mergers in Galactic Nuclei
Due to Dynamical Hardening.” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2017. https://doi.org/10.1093/mnras/stx3134.
ieee: N. W. C. Leigh et al., “On the rate of black hole binary mergers in
galactic nuclei due to dynamical hardening,” Monthly Notices of the Royal Astronomical
Society, vol. 474, no. 4. Oxford University Press, pp. 5672–5683, 2017.
ista: Leigh NWC, Geller AM, McKernan B, Ford KES, Mac Low M-M, Bellovary J, Haiman
Z, Lyra W, Samsing J, O’Dowd M, Kocsis B, Endlich S. 2017. On the rate of black
hole binary mergers in galactic nuclei due to dynamical hardening. Monthly Notices
of the Royal Astronomical Society. 474(4), 5672–5683.
mla: Leigh, N. W. C., et al. “On the Rate of Black Hole Binary Mergers in Galactic
Nuclei Due to Dynamical Hardening.” Monthly Notices of the Royal Astronomical
Society, vol. 474, no. 4, Oxford University Press, 2017, pp. 5672–83, doi:10.1093/mnras/stx3134.
short: N.W.C. Leigh, A.M. Geller, B. McKernan, K.E.S. Ford, M.-M. Mac Low, J. Bellovary,
Z. Haiman, W. Lyra, J. Samsing, M. O’Dowd, B. Kocsis, S. Endlich, Monthly Notices
of the Royal Astronomical Society 474 (2017) 5672–5683.
date_created: 2024-09-05T14:16:03Z
date_published: 2017-12-05T00:00:00Z
date_updated: 2024-09-24T10:21:37Z
day: '05'
doi: 10.1093/mnras/stx3134
extern: '1'
external_id:
arxiv:
- '1711.10494'
intvolume: ' 474'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.1711.10494'
month: '12'
oa: 1
oa_version: Preprint
page: 5672-5683
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: On the rate of black hole binary mergers in galactic nuclei due to dynamical
hardening
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 474
year: '2017'
...
---
_id: '17633'
abstract:
- lang: eng
text: 'Using few-body simulations, we investigate the evolution of supermassive
black holes (SMBHs) in galaxies (M* = 1010–1012 M⊙ at z = 0) at 0 < z < 4. Following
galaxy merger trees from the Millennium simulation, we model BH mergers with two
extreme binary decay scenarios for the ‘hard binary’ stage: a full or an empty
loss cone. These two models should bracket the true evolution, and allow us to
separately explore the role of dynamical friction and that of multibody BH interactions
on BH mergers. Using the computed merger rates, we infer the stochastic gravitational
wave background (GWB). Our dynamical approach is a first attempt to study the
dynamical evolution of multiple SMBHs in the host galaxies undergoing mergers
with various mass ratios (10−4 < q* < 1). Our main result demonstrates that SMBH
binaries are able to merge in both scenarios. In the empty loss cone case, we
find that BHs merge via multibody interactions, avoiding the ‘final parsec’ problem,
and entering the pulsar timing arrays band with substantial orbital eccentricity.
Our full loss cone treatment, albeit more approximate, suggests that the eccentricity
becomes even higher when GWs become dominant, leading to rapid coalescences (binary
lifetime ≲1 Gyr). Despite the lower merger rates in the empty loss cone case,
due to their higher mass ratios and lower redshifts, the GWB in the full/empty
loss cone models are comparable (0.70 × 10−15 and 0.53 × 10−15 at a frequency
of 1 yr−1, respectively). Finally, we compute the effects of high eccentricities
on the GWB spectrum.'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Taeho
full_name: Ryu, Taeho
last_name: Ryu
- 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
- first_name: Jeremiah P.
full_name: Ostriker, Jeremiah P.
last_name: Ostriker
- first_name: Nicholas C.
full_name: Stone, Nicholas C.
last_name: Stone
citation:
ama: 'Ryu T, Perna R, Haiman Z, Ostriker JP, Stone NC. Interactions between multiple
supermassive black holes in galactic nuclei: A solution to the final parsec problem.
Monthly Notices of the Royal Astronomical Society. 2017;473(3):3410-3433.
doi:10.1093/mnras/stx2524'
apa: 'Ryu, T., Perna, R., Haiman, Z., Ostriker, J. P., & Stone, N. C. (2017).
Interactions between multiple supermassive black holes in galactic nuclei: A solution
to the final parsec problem. Monthly Notices of the Royal Astronomical Society.
Oxford University Press. https://doi.org/10.1093/mnras/stx2524'
chicago: 'Ryu, Taeho, Rosalba Perna, Zoltán Haiman, Jeremiah P. Ostriker, and Nicholas
C. Stone. “Interactions between Multiple Supermassive Black Holes in Galactic
Nuclei: A Solution to the Final Parsec Problem.” Monthly Notices of the Royal
Astronomical Society. Oxford University Press, 2017. https://doi.org/10.1093/mnras/stx2524.'
ieee: 'T. Ryu, R. Perna, Z. Haiman, J. P. Ostriker, and N. C. Stone, “Interactions
between multiple supermassive black holes in galactic nuclei: A solution to the
final parsec problem,” Monthly Notices of the Royal Astronomical Society,
vol. 473, no. 3. Oxford University Press, pp. 3410–3433, 2017.'
ista: 'Ryu T, Perna R, Haiman Z, Ostriker JP, Stone NC. 2017. Interactions between
multiple supermassive black holes in galactic nuclei: A solution to the final
parsec problem. Monthly Notices of the Royal Astronomical Society. 473(3), 3410–3433.'
mla: 'Ryu, Taeho, et al. “Interactions between Multiple Supermassive Black Holes
in Galactic Nuclei: A Solution to the Final Parsec Problem.” Monthly Notices
of the Royal Astronomical Society, vol. 473, no. 3, Oxford University Press,
2017, pp. 3410–33, doi:10.1093/mnras/stx2524.'
short: T. Ryu, R. Perna, Z. Haiman, J.P. Ostriker, N.C. Stone, Monthly Notices of
the Royal Astronomical Society 473 (2017) 3410–3433.
date_created: 2024-09-05T14:16:56Z
date_published: 2017-09-27T00:00:00Z
date_updated: 2024-09-24T11:14:57Z
day: '27'
doi: 10.1093/mnras/stx2524
extern: '1'
external_id:
arxiv:
- '1709.06501'
intvolume: ' 473'
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.1709.06501'
month: '09'
oa: 1
oa_version: Preprint
page: 3410-3433
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: 'Interactions between multiple supermassive black holes in galactic nuclei:
A solution to the final parsec problem'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 473
year: '2017'
...
---
_id: '17667'
abstract:
- lang: eng
text: The Direct Collapse Black Hole (DCBH) scenario provides a solution for forming
the massive black holes powering bright quasars observed in the early Universe.
A prerequisite for forming a DCBH is that the formation of (much less massive)
Population III stars be avoided - this can be achieved by destroying H2 via Lyman-Werner
(LW) radiation (ELW = 12.6 eV). We find that two conditions must be met in the
proto-galaxy that will host the DCBH. First, prior star formation must be delayed;
this can be achieved with a background LW flux of JBG≳100 J21. Second, an intense
burst of LW radiation from a neighbouring star-bursting proto-galaxy is required,
just before the gas cloud undergoes gravitational collapse, to finally suppress
star formation completely. We show here for the first time using high-resolution
hydrodynamical simulations, including full radiative transfer, that this low-level
background, combined with tight synchronisation and irradiation of a secondary
proto-galaxy by a primary proto-galaxy, inevitably moves the secondary proto-galaxy
onto the isothermal atomic cooling track, without the deleterious effects of either
photo-evaporating the gas or polluting it by heavy elements. These, atomically
cooled, massive proto-galaxies are expected to ultimately form a DCBH of mass
104−105M⊙.
article_number: '0075'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: John A.
full_name: Regan, John A.
last_name: Regan
- first_name: Eli
full_name: Visbal, Eli
last_name: Visbal
- first_name: John H.
full_name: Wise, John H.
last_name: Wise
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
- first_name: Peter H.
full_name: Johansson, Peter H.
last_name: Johansson
- first_name: Greg L.
full_name: Bryan, Greg L.
last_name: Bryan
citation:
ama: Regan JA, Visbal E, Wise JH, Haiman Z, Johansson PH, Bryan GL. Rapid formation
of massive black holes in close proximity to embryonic protogalaxies. Nature
Astronomy. 2017;1(4). doi:10.1038/s41550-017-0075
apa: Regan, J. A., Visbal, E., Wise, J. H., Haiman, Z., Johansson, P. H., &
Bryan, G. L. (2017). Rapid formation of massive black holes in close proximity
to embryonic protogalaxies. Nature Astronomy. Springer Science and Business
Media LLC. https://doi.org/10.1038/s41550-017-0075
chicago: Regan, John A., Eli Visbal, John H. Wise, Zoltán Haiman, Peter H. Johansson,
and Greg L. Bryan. “Rapid Formation of Massive Black Holes in Close Proximity
to Embryonic Protogalaxies.” Nature Astronomy. Springer Science and Business
Media LLC, 2017. https://doi.org/10.1038/s41550-017-0075.
ieee: J. A. Regan, E. Visbal, J. H. Wise, Z. Haiman, P. H. Johansson, and G. L.
Bryan, “Rapid formation of massive black holes in close proximity to embryonic
protogalaxies,” Nature Astronomy, vol. 1, no. 4. Springer Science and Business
Media LLC, 2017.
ista: Regan JA, Visbal E, Wise JH, Haiman Z, Johansson PH, Bryan GL. 2017. Rapid
formation of massive black holes in close proximity to embryonic protogalaxies.
Nature Astronomy. 1(4), 0075.
mla: Regan, John A., et al. “Rapid Formation of Massive Black Holes in Close Proximity
to Embryonic Protogalaxies.” Nature Astronomy, vol. 1, no. 4, 0075, Springer
Science and Business Media LLC, 2017, doi:10.1038/s41550-017-0075.
short: J.A. Regan, E. Visbal, J.H. Wise, Z. Haiman, P.H. Johansson, G.L. Bryan,
Nature Astronomy 1 (2017).
date_created: 2024-09-06T07:45:20Z
date_published: 2017-03-13T00:00:00Z
date_updated: 2024-09-25T07:54:31Z
day: '13'
doi: 10.1038/s41550-017-0075
extern: '1'
external_id:
arxiv:
- '1703.03805'
intvolume: ' 1'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.1703.03805'
month: '03'
oa: 1
oa_version: Preprint
publication: Nature Astronomy
publication_identifier:
issn:
- 2397-3366
publication_status: published
publisher: Springer Science and Business Media LLC
quality_controlled: '1'
scopus_import: '1'
status: public
title: Rapid formation of massive black holes in close proximity to embryonic protogalaxies
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 1
year: '2017'
...
---
_id: '17668'
abstract:
- lang: eng
text: Suppression of H2-cooling in early protogalaxies has important implications
for the formation of supermassive black holes seeds, the first generation of stars,
and the epoch of reionization. This suppression can occur via photodissociation
of H2 (by ultraviolet Lyman-Werner [LW] photons) or by photodetachment of H-,
a precursor in H2 formation (by infrared [IR] photons). Previous studies have
typically adopted idealised spectra, with a blackbody or a power-law shape, in
modeling the chemistry of metal-free protogalaxies, and utilised a single parameter,
the critical UV flux, or Jcrit, to determine whether H2-cooling is prevented.
This can be misleading, and that independent of the spectral shape, there is a
critical curve in the (kLW , kH^- ) plane, where kLW and kH^- are the H2-dissocation
rates by LW and IR photons, which determines whether a protogalaxy can cool below
~1000 Kelvin. We use a one-zone model to follow the chemical and thermal evolution
of gravitationally collapsing protogalactic gas, to compute this critical curve,
and provide an accurate analytical fit for it. We improve on previous works by
considering a variety of more realistic Pop III or Pop II-type spectra from population
synthesis models and perform fully frequency-dependent calculations of the H2-photodissociation
rates for each spectrum. We compute the ratio kLW/kH^- for each spectrum, as well
as the minimum stellar mass M_star, for various IMFs and metallicities, required
to prevent cooling in a neighboring halo a distance d away. We provide critical
M_star/d2 values for suppression of H2-cooling, with analytic fits, which can
be used in future studies.
article_number: stx167
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
- first_name: G. L.
full_name: Bryan, G. L.
last_name: Bryan
citation:
ama: 'Wolcott-Green J, Haiman Z, Bryan GL. Beyond Jcrit: A critical curve for suppression
of H2-cooling in protogalaxies. Monthly Notices of the Royal Astronomical Society.
2017. doi:10.1093/mnras/stx167'
apa: 'Wolcott-Green, J., Haiman, Z., & Bryan, G. L. (2017). Beyond Jcrit: A
critical curve for suppression of H2-cooling in protogalaxies. Monthly Notices
of the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1093/mnras/stx167'
chicago: 'Wolcott-Green, J., Zoltán Haiman, and G. L. Bryan. “Beyond Jcrit: A Critical
Curve for Suppression of H2-Cooling in Protogalaxies.” Monthly Notices of the
Royal Astronomical Society. Oxford University Press, 2017. https://doi.org/10.1093/mnras/stx167.'
ieee: 'J. Wolcott-Green, Z. Haiman, and G. L. Bryan, “Beyond Jcrit: A critical curve
for suppression of H2-cooling in protogalaxies,” Monthly Notices of the Royal
Astronomical Society. Oxford University Press, 2017.'
ista: 'Wolcott-Green J, Haiman Z, Bryan GL. 2017. Beyond Jcrit: A critical curve
for suppression of H2-cooling in protogalaxies. Monthly Notices of the Royal Astronomical
Society., stx167.'
mla: 'Wolcott-Green, J., et al. “Beyond Jcrit: A Critical Curve for Suppression
of H2-Cooling in Protogalaxies.” Monthly Notices of the Royal Astronomical
Society, stx167, Oxford University Press, 2017, doi:10.1093/mnras/stx167.'
short: J. Wolcott-Green, Z. Haiman, G.L. Bryan, Monthly Notices of the Royal Astronomical
Society (2017).
date_created: 2024-09-06T07:46:13Z
date_published: 2017-01-20T00:00:00Z
date_updated: 2024-09-25T07:58:06Z
day: '20'
doi: 10.1093/mnras/stx167
extern: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1093/mnras/stx167
month: '01'
oa: 1
oa_version: Published Version
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: 'Beyond Jcrit: A critical curve for suppression of H2-cooling in protogalaxies'
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
year: '2017'
...
---
_id: '17673'
abstract:
- lang: eng
text: Accurate forward modeling of weak lensing (WL) observables from cosmological
parameters is necessary for upcoming galaxy surveys. Because WL probes structures
in the non-linear regime, analytical forward modeling is very challenging, if
not impossible. Numerical simulations of WL features rely on ray-tracing through
the outputs of N-body simulations, which requires knowledge of the gravitational
potential and accurate solvers for light ray trajectories. A less accurate procedure,
based on the Born approximation, only requires knowledge of the density field,
and can be implemented more efficiently and at a lower computational cost. In
this work, we use simulations to show that deviations of the Born-approximated
convergence power spectrum, skewness and kurtosis from their fully ray--traced
counterparts are consistent with the smallest non-trivial O(Φ3) post-Born corrections
(so-called geodesic and lens-lens terms). Our results imply a cancellation among
the larger O(Φ4) (and higher order) terms, consistent with previous analytic work.
We also find that cosmological parameter bias induced by the Born approximated
power spectrum is negligible even for an LSST-like survey, once galaxy shape noise
is considered. When considering higher order statistics such as the κ skewness
and kurtosis, however, we find significant bias of up to 2.5σ. Using the LensTools
software suite, we show that the Born approximation saves a factor of 4 in computing
time with respect to the full ray-tracing in reconstructing the convergence.
article_number: '123503'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Andrea
full_name: Petri, Andrea
last_name: Petri
- 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
citation:
ama: Petri A, Haiman Z, May M. Validity of the Born approximation for beyond Gaussian
weak lensing observables. Physical Review D. 2017;95(12). doi:10.1103/physrevd.95.123503
apa: Petri, A., Haiman, Z., & May, M. (2017). Validity of the Born approximation
for beyond Gaussian weak lensing observables. Physical Review D. American
Physical Society. https://doi.org/10.1103/physrevd.95.123503
chicago: Petri, Andrea, Zoltán Haiman, and Morgan May. “Validity of the Born Approximation
for beyond Gaussian Weak Lensing Observables.” Physical Review D. American
Physical Society, 2017. https://doi.org/10.1103/physrevd.95.123503.
ieee: A. Petri, Z. Haiman, and M. May, “Validity of the Born approximation for beyond
Gaussian weak lensing observables,” Physical Review D, vol. 95, no. 12.
American Physical Society, 2017.
ista: Petri A, Haiman Z, May M. 2017. Validity of the Born approximation for beyond
Gaussian weak lensing observables. Physical Review D. 95(12), 123503.
mla: Petri, Andrea, et al. “Validity of the Born Approximation for beyond Gaussian
Weak Lensing Observables.” Physical Review D, vol. 95, no. 12, 123503,
American Physical Society, 2017, doi:10.1103/physrevd.95.123503.
short: A. Petri, Z. Haiman, M. May, Physical Review D 95 (2017).
date_created: 2024-09-06T07:50:00Z
date_published: 2017-06-06T00:00:00Z
date_updated: 2024-09-25T08:32:32Z
day: '06'
doi: 10.1103/physrevd.95.123503
extern: '1'
external_id:
arxiv:
- '1612.00852'
intvolume: ' 95'
issue: '12'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.1612.00852'
month: '06'
oa: 1
oa_version: Preprint
publication: Physical Review D
publication_identifier:
issn:
- 2470-0010
- 2470-0029
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Validity of the Born approximation for beyond Gaussian weak lensing observables
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 95
year: '2017'
...
---
_id: '17696'
abstract:
- lang: eng
text: We utilize cosmological hydrodynamic simulations to study the formation of
Population III (Pop III) stars in dark matter halos exposed to strong ionizing
radiation. We simulate the formation of three halos subjected to a wide range
of ionizing fluxes, and find that for high flux, ionization and photoheating can
delay gas collapse and star formation up to halo masses significantly larger than
the atomic cooling threshold. The threshold halo mass at which gas first collapses
and cools increases with ionizing flux for intermediate values, and saturates
at a value approximately an order of magnitude above the atomic cooling threshold
for extremely high flux (e.g. ≈5×108 M⊙ at z≈6). This behavior can be understood
in terms of photoheating, ionization/recombination, and Lyα cooling in the pressure-supported,
self-shielded gas core at the center of the growing dark matter halo. We examine
the spherically-averaged radial velocity profiles of collapsing gas and find that
a gas mass of up to ≈106 M⊙ can reach the central regions within 3 Myr, providing
an upper limit on the amount of massive Pop III stars that can form. The ionizing
radiation increases this limit by a factor of a few compared to strong Lyman-Werner
(LW) radiation alone. We conclude that the bright HeII 1640 Å emission recently
observed from the high-redshift galaxy CR7 cannot be explained by Pop III stars
alone. However, in some halos, a sufficient number of Pop III stars may form to
be detectable with future telescopes such as the James Webb Space Telescope (JWST).
article_processing_charge: No
article_type: original
author:
- first_name: Eli
full_name: Visbal, Eli
last_name: Visbal
- first_name: Greg L.
full_name: Bryan, Greg L.
last_name: Bryan
- first_name: Zoltán
full_name: Haiman, Zoltán
id: 7c006e8c-cc0d-11ee-8322-cb904ef76f36
last_name: Haiman
citation:
ama: Visbal E, Bryan GL, Haiman Z. What is the maximum mass of a Population III
galaxy? Monthly Notices of the Royal Astronomical Society. 2017;469(2):1456-1465.
doi:10.1093/mnras/stx909
apa: Visbal, E., Bryan, G. L., & Haiman, Z. (2017). What is the maximum mass
of a Population III galaxy? Monthly Notices of the Royal Astronomical Society.
Oxford University Press. https://doi.org/10.1093/mnras/stx909
chicago: Visbal, Eli, Greg L. Bryan, and Zoltán Haiman. “What Is the Maximum Mass
of a Population III Galaxy?” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2017. https://doi.org/10.1093/mnras/stx909.
ieee: E. Visbal, G. L. Bryan, and Z. Haiman, “What is the maximum mass of a Population
III galaxy?,” Monthly Notices of the Royal Astronomical Society, vol. 469,
no. 2. Oxford University Press, pp. 1456–1465, 2017.
ista: Visbal E, Bryan GL, Haiman Z. 2017. What is the maximum mass of a Population
III galaxy? Monthly Notices of the Royal Astronomical Society. 469(2), 1456–1465.
mla: Visbal, Eli, et al. “What Is the Maximum Mass of a Population III Galaxy?”
Monthly Notices of the Royal Astronomical Society, vol. 469, no. 2, Oxford
University Press, 2017, pp. 1456–65, doi:10.1093/mnras/stx909.
short: E. Visbal, G.L. Bryan, Z. Haiman, Monthly Notices of the Royal Astronomical
Society 469 (2017) 1456–1465.
date_created: 2024-09-06T08:42:13Z
date_published: 2017-04-17T00:00:00Z
date_updated: 2024-09-25T10:12:10Z
day: '17'
doi: 10.1093/mnras/stx909
extern: '1'
intvolume: ' 469'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1093/mnras/stx909
month: '04'
oa: 1
oa_version: Published Version
page: 1456-1465
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: What is the maximum mass of a Population III galaxy?
type: journal_article
user_id: 317138e5-6ab7-11ef-aa6d-ffef3953e345
volume: 469
year: '2017'
...