Exact solutions of Brans–Dicke cosmology with decaying vacuum density

Detalhes bibliográficos
Autor(a) principal: Montenegro Jr., A. E.
Data de Publicação: 2007
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/14737
Resumo: Texto completo: acesso restrito. p. 313-327
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spelling Montenegro Jr., A. E.Carneiro, SauloMontenegro Jr., A. E.Carneiro, Saulo2014-03-12T18:01:42Z20070264-9381http://repositorio.ufba.br/ri/handle/ri/14737v. 24, n. 2Texto completo: acesso restrito. p. 313-327We investigate cosmological solutions of Brans–Dicke theory with both the vacuum energy density and the gravitational constant decaying linearly with the Hubble parameter. A particular class of them, with a constant deceleration factor, sheds light on the cosmological constant problems, leading to a presently small vacuum term, and to a constant ratio between the vacuum and matter energy densities. By fixing the only free parameter of these solutions, we obtain cosmological parameters in accordance with observations of both the relative matter density and the universe age. In addition, we have three other solutions, with Brans–Dicke parameter ω = −1 and negative cosmological term, two of them with a future singularity of big-rip type. Although interesting from the theoretical point of view, two of them are not in agreement with the observed universe. The third one leads, in the limit of large times, to a constant relative matter density, being also a possible solution to the cosmic coincidence problem.Submitted by Suelen Reis (suziy.ellen@gmail.com) on 2014-03-12T12:57:02Z No. of bitstreams: 1 0264-9381_24_2_004.pdf: 254851 bytes, checksum: 8e17656d179e1abf6f756a069d628020 (MD5)Approved for entry into archive by Alda Lima da Silva (sivalda@ufba.br) on 2014-03-12T18:01:42Z (GMT) No. of bitstreams: 1 0264-9381_24_2_004.pdf: 254851 bytes, checksum: 8e17656d179e1abf6f756a069d628020 (MD5)Made available in DSpace on 2014-03-12T18:01:42Z (GMT). No. of bitstreams: 1 0264-9381_24_2_004.pdf: 254851 bytes, checksum: 8e17656d179e1abf6f756a069d628020 (MD5) Previous issue date: 2007http://dx.doi.org/10.1088/0264-9381/24/2/004reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBAExact solutions of Brans–Dicke cosmology with decaying vacuum densityClassical and Quantum Gravityinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01info:eu-repo/semantics/openAccessengLICENSElicense.txtlicense.txttext/plain1345https://repositorio.ufba.br/bitstream/ri/14737/2/license.txt0d4b811ef71182510d2015daa7c8a900MD52ORIGINAL0264-9381_24_2_004.pdf0264-9381_24_2_004.pdfapplication/pdf254851https://repositorio.ufba.br/bitstream/ri/14737/1/0264-9381_24_2_004.pdf8e17656d179e1abf6f756a069d628020MD51TEXT0264-9381_24_2_004.pdf.txt0264-9381_24_2_004.pdf.txtExtracted texttext/plain31820https://repositorio.ufba.br/bitstream/ri/14737/3/0264-9381_24_2_004.pdf.txt22e0cafb9fbd71cf58b8540b678047b2MD53ri/147372022-07-05 14:03:48.861oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:03:48Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Exact solutions of Brans–Dicke cosmology with decaying vacuum density
dc.title.alternative.pt_BR.fl_str_mv Classical and Quantum Gravity
title Exact solutions of Brans–Dicke cosmology with decaying vacuum density
spellingShingle Exact solutions of Brans–Dicke cosmology with decaying vacuum density
Montenegro Jr., A. E.
title_short Exact solutions of Brans–Dicke cosmology with decaying vacuum density
title_full Exact solutions of Brans–Dicke cosmology with decaying vacuum density
title_fullStr Exact solutions of Brans–Dicke cosmology with decaying vacuum density
title_full_unstemmed Exact solutions of Brans–Dicke cosmology with decaying vacuum density
title_sort Exact solutions of Brans–Dicke cosmology with decaying vacuum density
author Montenegro Jr., A. E.
author_facet Montenegro Jr., A. E.
Carneiro, Saulo
author_role author
author2 Carneiro, Saulo
author2_role author
dc.contributor.author.fl_str_mv Montenegro Jr., A. E.
Carneiro, Saulo
Montenegro Jr., A. E.
Carneiro, Saulo
description Texto completo: acesso restrito. p. 313-327
publishDate 2007
dc.date.issued.fl_str_mv 2007
dc.date.accessioned.fl_str_mv 2014-03-12T18:01:42Z
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dc.identifier.uri.fl_str_mv http://repositorio.ufba.br/ri/handle/ri/14737
dc.identifier.issn.none.fl_str_mv 0264-9381
dc.identifier.number.pt_BR.fl_str_mv v. 24, n. 2
identifier_str_mv 0264-9381
v. 24, n. 2
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