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https://repositorio.ufba.br/handle/ri/14074
metadata.dc.type: | Artigo de Periódico |
Title: | Observational constraints on late-time Λ(t) cosmology |
Other Titles: | Physical Review D |
Authors: | Silva, Saulo Carneiro de Souza Dantas, Maria Aldinêz Pigozzo, Cássio Bruno Magalhães Alcaniz, Jailson Souza de |
metadata.dc.creator: | Silva, Saulo Carneiro de Souza Dantas, Maria Aldinêz Pigozzo, Cássio Bruno Magalhães Alcaniz, Jailson Souza de |
Abstract: | The cosmological constant Λ, i.e., the energy density stored in the true vacuum state of all existing fields in the Universe, is the simplest and the most natural possibility to describe the current cosmic acceleration. However, despite its observational successes, such a possibility exacerbates the well-known Λ problem, requiring a natural explanation for its small, but nonzero, value. In this paper we study cosmological consequences of a scenario driven by a varying cosmological term, in which the vacuum energy density decays linearly with the Hubble parameter, Λ∝H. We test the viability of this scenario and study a possible way to distinguish it from the current standard cosmological model by using recent observations of type Ia supernova (Supernova Legacy Survey Collaboration), measurements of the baryonic acoustic oscillation from the Sloan Digital Sky Survey, and the position of the first peak of the cosmic microwave background angular spectrum from the three-year Wilkinson Microwave Anisotropy Probe. |
Keywords: | Cosmologia Ciencias do espaço |
metadata.dc.publisher.country: | Brasil |
metadata.dc.rights: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/14074 |
Issue Date: | 2008 |
Appears in Collections: | Artigo Publicado em Periódico (FIS) |
Files in This Item:
File | Description | Size | Format | |
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PhysRevD.77.083504-1.pdf | 514,24 kB | Adobe PDF | View/Open |
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