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http://acervodigital.unesp.br/handle/11449/24339
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DC Field | Value | Language |
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dc.contributor.author | Brax, Ph. | - |
dc.contributor.author | Rosenfeld, Rogério | - |
dc.contributor.author | Steer, D. A. | - |
dc.date.accessioned | 2013-09-30T18:55:53Z | - |
dc.date.accessioned | 2014-05-20T14:10:34Z | - |
dc.date.accessioned | 2016-10-25T17:21:23Z | - |
dc.date.available | 2013-09-30T18:55:53Z | - |
dc.date.available | 2014-05-20T14:10:34Z | - |
dc.date.available | 2016-10-25T17:21:23Z | - |
dc.date.issued | 2010-08-01 | - |
dc.identifier | http://dx.doi.org/10.1088/1475-7516/2010/08/033 | - |
dc.identifier.citation | Journal of Cosmology and Astroparticle Physics. Bristol: Iop Publishing Ltd, n. 8, p. 26, 2010. | - |
dc.identifier.issn | 1475-7516 | - |
dc.identifier.uri | http://hdl.handle.net/11449/24339 | - |
dc.identifier.uri | http://acervodigital.unesp.br/handle/11449/24339 | - |
dc.description.abstract | We 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.sponsorship | Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) | - |
dc.description.sponsorship | Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | - |
dc.description.sponsorship | Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) | - |
dc.description.sponsorship | EU Marie Curie Research & Training network "UniverseNet" | - |
dc.description.sponsorship | Agence Nationale de la Recherche | - |
dc.format.extent | 26 | - |
dc.language.iso | eng | - |
dc.publisher | Iop Publishing Ltd | - |
dc.source | Web of Science | - |
dc.subject | modified gravity | en |
dc.subject | dark energy theory | en |
dc.title | Spherical collapse in chameleon models | en |
dc.type | outro | - |
dc.contributor.institution | CEA | - |
dc.contributor.institution | Universidade Estadual Paulista (UNESP) | - |
dc.contributor.institution | Univ Paris 07 | - |
dc.description.affiliation | CEA, IPhT, CNRS, Inst Phys Theor,URA 2306, F-91191 Gif Sur Yvette, France | - |
dc.description.affiliation | Univ Estadual Paulista, Inst Fis Teor, BR-01140070 São Paulo, Brazil | - |
dc.description.affiliation | Univ Paris 07, CNRS, UMR 7164, APC, F-75205 Paris 13, France | - |
dc.description.affiliationUnesp | Univ Estadual Paulista, Inst Fis Teor, BR-01140070 São Paulo, Brazil | - |
dc.description.sponsorshipId | EU Marie Curie Research & Training network "UniverseNet": MRTN-CT-2006-035863 | - |
dc.description.sponsorshipId | Agence Nationale de la Recherche: ANR-09-BLAN-0157 | - |
dc.identifier.doi | 10.1088/1475-7516/2010/08/033 | - |
dc.identifier.wos | WOS:000283575000007 | - |
dc.rights.accessRights | Acesso restrito | - |
dc.relation.ispartof | Journal of Cosmology and Astroparticle Physics | - |
Appears in Collections: | Artigos, TCCs, Teses e Dissertações da Unesp |
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