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dc.contributor.authorAbramo, L. R.-
dc.contributor.authorBatista, R. C.-
dc.contributor.authorLiberato, L.-
dc.contributor.authorRosenfeld, Rogério-
dc.identifier.citationPhysical Review D. College Pk: Amer Physical Soc, v. 79, n. 2, p. 9, 2009.-
dc.description.abstractThe 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.en
dc.publisherAmer Physical Soc-
dc.sourceWeb of Science-
dc.titlePhysical approximations for the nonlinear evolution of perturbations in inhomogeneous dark energy scenariosen
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationUniv São Paulo, Inst Fis, BR-05315970 São Paulo, Brazil-
dc.description.affiliationUniv Estadual Paulista, Inst Fis Teor, BR-01405900 São Paulo, Brazil-
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Teor, BR-01405900 São Paulo, Brazil-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofPhysical Review D-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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