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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/24339
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dc.contributor.authorBrax, Ph.-
dc.contributor.authorRosenfeld, Rogério-
dc.contributor.authorSteer, D. A.-
dc.date.accessioned2013-09-30T18:55:53Z-
dc.date.accessioned2014-05-20T14:10:34Z-
dc.date.accessioned2016-10-25T17:21:23Z-
dc.date.available2013-09-30T18:55:53Z-
dc.date.available2014-05-20T14:10:34Z-
dc.date.available2016-10-25T17:21:23Z-
dc.date.issued2010-08-01-
dc.identifierhttp://dx.doi.org/10.1088/1475-7516/2010/08/033-
dc.identifier.citationJournal of Cosmology and Astroparticle Physics. Bristol: Iop Publishing Ltd, n. 8, p. 26, 2010.-
dc.identifier.issn1475-7516-
dc.identifier.urihttp://hdl.handle.net/11449/24339-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/24339-
dc.description.abstractWe study the gravitational collapse of an overdensity of nonrelativistic matter under the action of gravity and a chameleon scalar field. We show that the spherical collapse model is modified by the presence of a chameleon field. In particular, we find that even though the chameleon effects can be potentially large at small scales, for a large enough initial size of the inhomogeneity the collapsing region possesses a thin shell that shields the modification of gravity induced by the chameleon field, recovering the standard gravity results. We analyse the behaviour of a collapsing shell in a cosmological setting in the presence of a thin shell and find that, in contrast to the usual case, the critical density for collapse in principle depends on the initial comoving size of the inhomogeneity.en
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
dc.description.sponsorshipEU Marie Curie Research & Training network "UniverseNet"-
dc.description.sponsorshipAgence Nationale de la Recherche-
dc.format.extent26-
dc.language.isoeng-
dc.publisherIop Publishing Ltd-
dc.sourceWeb of Science-
dc.subjectmodified gravityen
dc.subjectdark energy theoryen
dc.titleSpherical collapse in chameleon modelsen
dc.typeoutro-
dc.contributor.institutionCEA-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniv Paris 07-
dc.description.affiliationCEA, IPhT, CNRS, Inst Phys Theor,URA 2306, F-91191 Gif Sur Yvette, France-
dc.description.affiliationUniv Estadual Paulista, Inst Fis Teor, BR-01140070 São Paulo, Brazil-
dc.description.affiliationUniv Paris 07, CNRS, UMR 7164, APC, F-75205 Paris 13, France-
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Teor, BR-01140070 São Paulo, Brazil-
dc.description.sponsorshipIdEU Marie Curie Research & Training network "UniverseNet": MRTN-CT-2006-035863-
dc.description.sponsorshipIdAgence Nationale de la Recherche: ANR-09-BLAN-0157-
dc.identifier.doi10.1088/1475-7516/2010/08/033-
dc.identifier.wosWOS:000283575000007-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Cosmology and Astroparticle Physics-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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