The signature of dark energy perturbations in galaxy cluster surveys
Models of dynamical dark energy unavoidably possess fluctuations in the energy density and pressure of that new component. In this paper we estimate the impact of dark energy fluctuations on the number of galaxy clusters in the Universe using a generalization of the spherical collapse model and the...
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Online Access: | http://acervodigital.unesp.br/handle/11449/24238 http://hdl.handle.net/11449/24238 https://doi.org/10.1088/1475-7516/2009/07/040 |
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ftunivesp:oai:acervodigital.unesp.br:11449/24238 2023-05-15T18:22:47+02:00 The signature of dark energy perturbations in galaxy cluster surveys Abramo, L. R. Batista, R. C. Rosenfeld, Rogério Universidade Estadual Paulista (UNESP) 2016-10-25T17:19:25Z http://acervodigital.unesp.br/handle/11449/24238 http://hdl.handle.net/11449/24238 https://doi.org/10.1088/1475-7516/2009/07/040 eng eng Iop Publishing Ltd Journal of Cosmology and Astroparticle Physics Journal of Cosmology and Astroparticle Physics. Bristol: Iop Publishing Ltd, n. 7, p. 13, 2009. 1475-7516 http://hdl.handle.net/11449/24238 http://acervodigital.unesp.br/handle/11449/24238 doi:10.1088/1475-7516/2009/07/040 WOS:000269971100027 http://dx.doi.org/10.1088/1475-7516/2009/07/040 info:eu-repo/semantics/closedAccess galaxy clusters cluster counts dark energy theory outro 2016 ftunivesp https://doi.org/10.1088/1475-7516/2009/07/040 2021-07-18T08:29:44Z Models of dynamical dark energy unavoidably possess fluctuations in the energy density and pressure of that new component. In this paper we estimate the impact of dark energy fluctuations on the number of galaxy clusters in the Universe using a generalization of the spherical collapse model and the Press-Schechter formalism. The observations we consider are several hypothetical Sunyaev-Zel'dovich and weak lensing (shear maps) cluster surveys, with limiting masses similar to ongoing (SPT, DES) as well as future (LSST, Euclid) surveys. Our statistical analysis is performed in a 7-dimensional cosmological parameter space using the Fisher matrix method. We find that, in some scenarios, the impact of these fluctuations is large enough that their effect could already be detected by existing instruments such as the South Pole Telescope, when priors from other standard cosmological probes are included. We also show how dark energy fluctuations can be a nuisance for constraining cosmological parameters with cluster counts, and point to a degeneracy between the parameter that describes dark energy pressure on small scales (the effective sound speed) and the parameters describing its equation of state. Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Other/Unknown Material South pole Universidade Estadual Paulista São Paulo: Acervo Digital da UNESP / São Paulo State University South Pole Journal of Cosmology and Astroparticle Physics 2009 07 040 040 |
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Universidade Estadual Paulista São Paulo: Acervo Digital da UNESP / São Paulo State University |
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ftunivesp |
language |
English |
topic |
galaxy clusters cluster counts dark energy theory |
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galaxy clusters cluster counts dark energy theory Abramo, L. R. Batista, R. C. Rosenfeld, Rogério The signature of dark energy perturbations in galaxy cluster surveys |
topic_facet |
galaxy clusters cluster counts dark energy theory |
description |
Models of dynamical dark energy unavoidably possess fluctuations in the energy density and pressure of that new component. In this paper we estimate the impact of dark energy fluctuations on the number of galaxy clusters in the Universe using a generalization of the spherical collapse model and the Press-Schechter formalism. The observations we consider are several hypothetical Sunyaev-Zel'dovich and weak lensing (shear maps) cluster surveys, with limiting masses similar to ongoing (SPT, DES) as well as future (LSST, Euclid) surveys. Our statistical analysis is performed in a 7-dimensional cosmological parameter space using the Fisher matrix method. We find that, in some scenarios, the impact of these fluctuations is large enough that their effect could already be detected by existing instruments such as the South Pole Telescope, when priors from other standard cosmological probes are included. We also show how dark energy fluctuations can be a nuisance for constraining cosmological parameters with cluster counts, and point to a degeneracy between the parameter that describes dark energy pressure on small scales (the effective sound speed) and the parameters describing its equation of state. Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) |
author2 |
Universidade Estadual Paulista (UNESP) |
format |
Other/Unknown Material |
author |
Abramo, L. R. Batista, R. C. Rosenfeld, Rogério |
author_facet |
Abramo, L. R. Batista, R. C. Rosenfeld, Rogério |
author_sort |
Abramo, L. R. |
title |
The signature of dark energy perturbations in galaxy cluster surveys |
title_short |
The signature of dark energy perturbations in galaxy cluster surveys |
title_full |
The signature of dark energy perturbations in galaxy cluster surveys |
title_fullStr |
The signature of dark energy perturbations in galaxy cluster surveys |
title_full_unstemmed |
The signature of dark energy perturbations in galaxy cluster surveys |
title_sort |
signature of dark energy perturbations in galaxy cluster surveys |
publisher |
Iop Publishing Ltd |
publishDate |
2016 |
url |
http://acervodigital.unesp.br/handle/11449/24238 http://hdl.handle.net/11449/24238 https://doi.org/10.1088/1475-7516/2009/07/040 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
Journal of Cosmology and Astroparticle Physics Journal of Cosmology and Astroparticle Physics. Bristol: Iop Publishing Ltd, n. 7, p. 13, 2009. 1475-7516 http://hdl.handle.net/11449/24238 http://acervodigital.unesp.br/handle/11449/24238 doi:10.1088/1475-7516/2009/07/040 WOS:000269971100027 http://dx.doi.org/10.1088/1475-7516/2009/07/040 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1088/1475-7516/2009/07/040 |
container_title |
Journal of Cosmology and Astroparticle Physics |
container_volume |
2009 |
container_issue |
07 |
container_start_page |
040 |
op_container_end_page |
040 |
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1766202204943810560 |