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Campo DC | Valor | Idioma |
---|---|---|
dc.contributor.author | Carneiro, Saulo | - |
dc.creator | Carneiro, Saulo | - |
dc.date.accessioned | 2013-10-30T18:05:16Z | - |
dc.date.issued | 2005 | - |
dc.identifier.issn | 0218-2718 | - |
dc.identifier.uri | http://repositorio.ufba.br/ri/handle/ri/13357 | - |
dc.description | Texto completo: acesso restrito. p.2201-2206 | pt_BR |
dc.description.abstract | Among the suggested solutions to the cosmological constant problem, we nd the idea of a dynamic vacuum, with an energy density decaying with the universe expansion. We investigate the possibility of a variation in the gravitational constant as well, induced,at the cosmological scale, by the vacuum decay. We consider an e ective Brans{Dicke theory in the spatially at FLRW spacetime, nding late time solutions characterized by a constant ratio between the matter and vacuum energy densities. By using the observed limits for the universe age, we x the only free parameter of our solutions, obtaining a relative matter density in the range 0:25 < m < 0:4. In particular, for Ht = 1 we obtain m = 1=3. This constitutes a possible explanation for another problem related to the cosmological term, the cosmic coincidence problem. | pt_BR |
dc.language.iso | en | pt_BR |
dc.rights | Acesso Aberto | pt_BR |
dc.source | http://dx.doi.org/ 10.1142/S021827180500784X | pt_BR |
dc.subject | Cosmological constant | pt_BR |
dc.subject | Scalar-tensor theories | pt_BR |
dc.title | The cosmic coincidence in Brans–Dicke cosmologies | pt_BR |
dc.title.alternative | International Journal of Modern Physics D | pt_BR |
dc.type | Artigo de Periódico | pt_BR |
dc.identifier.number | v.14 n. 12 | pt_BR |
dc.embargo.liftdate | 10000-01-01 | - |
Aparece nas coleções: | Artigo Publicado em Periódico (FIS) |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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SAULO CARNEIRO.pdf | 180,72 kB | Adobe PDF | Visualizar/Abrir |
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