Friedmann cosmology with decaying vacuum density

Detalhes bibliográficos
Autor(a) principal: Borges, H. A.
Data de Publicação: 2005
Outros Autores: Carneiro, Saulo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://repositorio.ufba.br/ri/handle/ri/13629
Resumo: Texto completo: acesso restrito.p.1385-1394
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spelling Borges, H. A.Carneiro, SauloBorges, H. A.Carneiro, Saulo2013-11-13T17:19:50Z20050001-7701http://repositorio.ufba.br/ri/handle/ri/13629v.37 n. 8Texto completo: acesso restrito.p.1385-1394Among the several proposals to solve the incompatibility between the observed small value of the cosmological constant and the huge value obtained by quantum field theories, we can find the idea of a decaying vacuum energy density, leading from high values at early times of universe evolution to the small value observed nowadays. In this paper we consider a variation law for the vacuum density recently proposed by Schützhold on the basis of quantum field estimations in the curved, expanding background, characterized by a vacuum density proportional to the Hubble parameter. We show that, in the context of an isotropic and homogeneous, spatially flat model, the corresponding solutions retain the well established features of the standard cosmology, and, in addition, are in accordance with the observed cosmological parameters. Our scenario presents an initial phase dominated by radiation, followed by a dust era long enough to permit structure formation, and by an epoch dominated by the cosmological term, which tends asymptotically to a de Sitter universe. Taking the matter density equals to half of the vacuum energy density, as suggested by observation, we obtain a universe age given by Ht = 1.1, and a decelerating parameter equals to −1/2.Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2013-11-13T10:36:41Z No. of bitstreams: 1 H. A. Borges.pdf: 223804 bytes, checksum: 474a864057f5c23007ddd1106ed5e30c (MD5)Approved for entry into archive by Rodrigo Meirelles (rodrigomei@ufba.br) on 2013-11-13T17:19:50Z (GMT) No. of bitstreams: 1 H. A. Borges.pdf: 223804 bytes, checksum: 474a864057f5c23007ddd1106ed5e30c (MD5)Made available in DSpace on 2013-11-13T17:19:50Z (GMT). No. of bitstreams: 1 H. A. Borges.pdf: 223804 bytes, checksum: 474a864057f5c23007ddd1106ed5e30c (MD5) Previous issue date: 2005http://dx.doi.org/10.1007/s10714-005-0122-zreponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAVacuum energyDe Sitter universeFriedmann cosmology with decaying vacuum densityGeneral Relativity and Gravitationinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01info:eu-repo/semantics/openAccessengORIGINALH. A. Borges.pdfH. A. Borges.pdfapplication/pdf223804https://repositorio.ufba.br/bitstream/ri/13629/1/H.%20A.%20Borges.pdf474a864057f5c23007ddd1106ed5e30cMD51LICENSElicense.txtlicense.txttext/plain1345https://repositorio.ufba.br/bitstream/ri/13629/2/license.txtff6eaa8b858ea317fded99f125f5fcd0MD52TEXTH. A. Borges.pdf.txtH. A. 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dc.title.pt_BR.fl_str_mv Friedmann cosmology with decaying vacuum density
dc.title.alternative.pt_BR.fl_str_mv General Relativity and Gravitation
title Friedmann cosmology with decaying vacuum density
spellingShingle Friedmann cosmology with decaying vacuum density
Borges, H. A.
Vacuum energy
De Sitter universe
title_short Friedmann cosmology with decaying vacuum density
title_full Friedmann cosmology with decaying vacuum density
title_fullStr Friedmann cosmology with decaying vacuum density
title_full_unstemmed Friedmann cosmology with decaying vacuum density
title_sort Friedmann cosmology with decaying vacuum density
author Borges, H. A.
author_facet Borges, H. A.
Carneiro, Saulo
author_role author
author2 Carneiro, Saulo
author2_role author
dc.contributor.author.fl_str_mv Borges, H. A.
Carneiro, Saulo
Borges, H. A.
Carneiro, Saulo
dc.subject.por.fl_str_mv Vacuum energy
De Sitter universe
topic Vacuum energy
De Sitter universe
description Texto completo: acesso restrito.p.1385-1394
publishDate 2005
dc.date.issued.fl_str_mv 2005
dc.date.accessioned.fl_str_mv 2013-11-13T17:19:50Z
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://repositorio.ufba.br/ri/handle/ri/13629
dc.identifier.issn.none.fl_str_mv 0001-7701
dc.identifier.number.pt_BR.fl_str_mv v.37 n. 8
identifier_str_mv 0001-7701
v.37 n. 8
url http://repositorio.ufba.br/ri/handle/ri/13629
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1007/s10714-005-0122-z
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