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metadata.dc.type: | Artigo de Periódico |
Title: | Non-adiabatic perturbations in decaying vacuum cosmology |
Other Titles: | Journal of Cosmology and Astroparticle Physics |
Authors: | Carneiro, Saulo Borges, H. A. Zimdahl, W. Fabris, J. C. Ricaldi, W. S. Hipólito |
metadata.dc.creator: | Carneiro, Saulo Borges, H. A. Zimdahl, W. Fabris, J. C. Ricaldi, W. S. Hipólito |
Abstract: | We investigate a spatially flat Friedmann-Lemaˆıtre-Robertson-Walker cosmology in which a decaying vacuum term causes matter production at late times. Assuming a decay proportional to the Hubble rate, the ratio of the background energy densities of dark matter and dark energy changes with the cosmic scale factor as a−3/2. The intrinsically non-adiabatic two-component perturbation dynamics of this model is reduced to a single second-order equation. Perturbations of the vacuum term are shown to be negligible on scales that are relevant for structure formation. On larger scales, dark-energy perturbations give a somewhat higher contribution but remain always smaller than the dark-matter perturbations. |
Keywords: | Galaxy clustering Dark matter theory Dark energy theory |
metadata.dc.rights: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/16050 |
Issue Date: | 2011 |
Appears in Collections: | Artigo Publicado em Periódico (FIS) |
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