The signature of dark energy perturbations in galaxy cluster surveys

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dc.contributor.authorAbramo, L. R.
dc.contributor.authorBatista, R. C.
dc.contributor.authorRosenfeld, Rogério [UNESP]
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2013-09-30T18:54:41Z
dc.date.accessioned2014-05-20T14:09:58Z
dc.date.available2013-09-30T18:54:41Z
dc.date.available2014-05-20T14:09:58Z
dc.date.issued2009-07-01
dc.description.abstractModels 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.en
dc.description.affiliationUniv São Paulo, Inst Fis, BR-05314970 São Paulo, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Fis Teor, BR-01140070 São Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Teor, BR-01140070 São Paulo, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent13
dc.identifierhttp://dx.doi.org/10.1088/1475-7516/2009/07/040
dc.identifier.citationJournal of Cosmology and Astroparticle Physics. Bristol: Iop Publishing Ltd, n. 7, p. 13, 2009.
dc.identifier.doi10.1088/1475-7516/2009/07/040
dc.identifier.issn1475-7516
dc.identifier.urihttp://hdl.handle.net/11449/24238
dc.identifier.wosWOS:000269971100027
dc.language.isoeng
dc.publisherIop Publishing Ltd
dc.relation.ispartofJournal of Cosmology and Astroparticle Physics
dc.relation.ispartofjcr5.126
dc.relation.ispartofsjr1,089
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectgalaxy clustersen
dc.subjectcluster countsen
dc.subjectdark energy theoryen
dc.titleThe signature of dark energy perturbations in galaxy cluster surveysen
dc.typeArtigo
dcterms.licensehttp://iopscience.iop.org/info/page/openaccess
dcterms.rightsHolderIop Publishing Ltd
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Física Teórica (IFT), São Paulopt

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