Physical approximations for the nonlinear evolution of perturbations in inhomogeneous dark energy scenarios
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1103/PhysRevD.79.023516 http://hdl.handle.net/11449/225416 |
Resumo: | The abundance and distribution of collapsed objects such as galaxy clusters will become an important tool to investigate the nature of dark energy and dark matter. Number counts of very massive objects are sensitive not only to the equation of state of dark energy, which parametrizes the smooth component of its pressure, but also to the sound speed of dark energy, which determines the amount of pressure in inhomogeneous and collapsed structures. Since the evolution of these structures must be followed well into the nonlinear regime, and a fully relativistic framework for this regime does not exist yet, we compare two approximate schemes: the widely used spherical collapse model and the pseudo-Newtonian approach. We show that both approximation schemes convey identical equations for the density contrast, when the pressure perturbation of dark energy is parametrized in terms of an effective sound speed. We also make a comparison of these approximate approaches to general relativity in the linearized regime, which lends some support to the approximations. © 2009 The American Physical Society. |
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Repositório Institucional da UNESP |
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Physical approximations for the nonlinear evolution of perturbations in inhomogeneous dark energy scenariosThe abundance and distribution of collapsed objects such as galaxy clusters will become an important tool to investigate the nature of dark energy and dark matter. Number counts of very massive objects are sensitive not only to the equation of state of dark energy, which parametrizes the smooth component of its pressure, but also to the sound speed of dark energy, which determines the amount of pressure in inhomogeneous and collapsed structures. Since the evolution of these structures must be followed well into the nonlinear regime, and a fully relativistic framework for this regime does not exist yet, we compare two approximate schemes: the widely used spherical collapse model and the pseudo-Newtonian approach. We show that both approximation schemes convey identical equations for the density contrast, when the pressure perturbation of dark energy is parametrized in terms of an effective sound speed. We also make a comparison of these approximate approaches to general relativity in the linearized regime, which lends some support to the approximations. © 2009 The American Physical Society.Instituto de Física Universidade de São Paulo, CP 66318, 05315-970, São PauloInstituto de Física Teórica Universidade Estadual Paulista, R. Pamplona 145, 01405-900, São PauloInstituto de Física Teórica Universidade Estadual Paulista, R. Pamplona 145, 01405-900, São PauloUniversidade de São Paulo (USP)Universidade Estadual Paulista (UNESP)Abramo, L. R.Batista, R. C.Liberato, L. [UNESP]Rosenfeld, R. [UNESP]2022-04-28T20:48:30Z2022-04-28T20:48:30Z2009-01-05info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1103/PhysRevD.79.023516Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 79, n. 2, 2009.1550-79981550-2368http://hdl.handle.net/11449/22541610.1103/PhysRevD.79.0235162-s2.0-60349114464Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPhysical Review D - Particles, Fields, Gravitation and Cosmologyinfo:eu-repo/semantics/openAccess2022-04-28T20:48:30Zoai:repositorio.unesp.br:11449/225416Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T13:40:05.310716Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Physical approximations for the nonlinear evolution of perturbations in inhomogeneous dark energy scenarios |
title |
Physical approximations for the nonlinear evolution of perturbations in inhomogeneous dark energy scenarios |
spellingShingle |
Physical approximations for the nonlinear evolution of perturbations in inhomogeneous dark energy scenarios Abramo, L. R. |
title_short |
Physical approximations for the nonlinear evolution of perturbations in inhomogeneous dark energy scenarios |
title_full |
Physical approximations for the nonlinear evolution of perturbations in inhomogeneous dark energy scenarios |
title_fullStr |
Physical approximations for the nonlinear evolution of perturbations in inhomogeneous dark energy scenarios |
title_full_unstemmed |
Physical approximations for the nonlinear evolution of perturbations in inhomogeneous dark energy scenarios |
title_sort |
Physical approximations for the nonlinear evolution of perturbations in inhomogeneous dark energy scenarios |
author |
Abramo, L. R. |
author_facet |
Abramo, L. R. Batista, R. C. Liberato, L. [UNESP] Rosenfeld, R. [UNESP] |
author_role |
author |
author2 |
Batista, R. C. Liberato, L. [UNESP] Rosenfeld, R. [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Abramo, L. R. Batista, R. C. Liberato, L. [UNESP] Rosenfeld, R. [UNESP] |
description |
The abundance and distribution of collapsed objects such as galaxy clusters will become an important tool to investigate the nature of dark energy and dark matter. Number counts of very massive objects are sensitive not only to the equation of state of dark energy, which parametrizes the smooth component of its pressure, but also to the sound speed of dark energy, which determines the amount of pressure in inhomogeneous and collapsed structures. Since the evolution of these structures must be followed well into the nonlinear regime, and a fully relativistic framework for this regime does not exist yet, we compare two approximate schemes: the widely used spherical collapse model and the pseudo-Newtonian approach. We show that both approximation schemes convey identical equations for the density contrast, when the pressure perturbation of dark energy is parametrized in terms of an effective sound speed. We also make a comparison of these approximate approaches to general relativity in the linearized regime, which lends some support to the approximations. © 2009 The American Physical Society. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009-01-05 2022-04-28T20:48:30Z 2022-04-28T20:48:30Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1103/PhysRevD.79.023516 Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 79, n. 2, 2009. 1550-7998 1550-2368 http://hdl.handle.net/11449/225416 10.1103/PhysRevD.79.023516 2-s2.0-60349114464 |
url |
http://dx.doi.org/10.1103/PhysRevD.79.023516 http://hdl.handle.net/11449/225416 |
identifier_str_mv |
Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 79, n. 2, 2009. 1550-7998 1550-2368 10.1103/PhysRevD.79.023516 2-s2.0-60349114464 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Physical Review D - Particles, Fields, Gravitation and Cosmology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128262831865856 |