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metadata.dc.type: | Artigo de Periódico |
Title: | From de sitter to de sitter: a non-singular inflationary universe driven by vacuum |
Authors: | Carneiro, Saulo |
metadata.dc.creator: | Carneiro, Saulo |
Abstract: | A semi-classical analysis of vacuum energy in the expanding space–time suggests that the cosmological term decays with time, with a concomitant matter production. For early times we find, in Planck units, Λ ≈ H4, where H is the Hubble parameter. The corresponding cosmological solution has no initial singularity, existing since an infinite past. During an infinitely long period we have a quasi-de Sitter, inflationary universe, with H ≈ 1. However, at a given time, the expansion undertakes a phase transition, with H and Λ decreasing to nearly zero in a few Planck times, producing a huge amount of radiation. On the other hand, the late-time scenario is similar to the standard model, with the radiation phase followed by a dust era, which tends asymptotically to a de Sitter universe, with vacuum dominating again. |
Keywords: | Inflation Dark energy Vacuum decay |
Publisher: | International Journal of Modern Physics D |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/12592 |
Issue Date: | 2006 |
Appears in Collections: | Artigo Publicado em Periódico (FIS) |
Files in This Item:
File | Description | Size | Format | |
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S0218271806009510.pdf Restricted Access | 152,83 kB | Adobe PDF | View/Open Request a copy |
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