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https://repositorio.ufba.br/handle/ri/16577
metadata.dc.type: | Artigo de Periódico |
Title: | A cosmological concordance model with dynamical vacuum term |
Other Titles: | Physics Letters B |
Authors: | Borges, Humberto de Almeida Alcaniz, Jailson Souza de Silva, Saulo Carneiro de Souza Fabris, Júlio César Pigozzo, Cássio Bruno Magalhães Wilhelm, Zimdahl Winfried Ernst |
metadata.dc.creator: | Borges, Humberto de Almeida Alcaniz, Jailson Souza de Silva, Saulo Carneiro de Souza Fabris, Júlio César Pigozzo, Cássio Bruno Magalhães Wilhelm, Zimdahl Winfried Ernst |
Abstract: | We demonstrate that creation of dark-matter particles at a constant rate implies the existence of a cosmological term that decays linearly with the Hubble rate. We discuss the cosmological model that arises in this context and test it against observations of the first acoustic peak in the cosmic microwave background (CMB) anisotropy spectrum, the Hubble diagram for supernovas of type Ia (SNIa), the distance scale of baryonic acoustic oscillations (BAO) and the distribution of large scale structures (LSS). We show that a good concordance is obtained, albeit with a higher value of the present matter abundance than in the ΛCDM model. We also comment on general features of the CMB anisotropy spectrum and on the cosmic coincidence problem. |
metadata.dc.rights: | Acesso Aberto |
URI: | http://repositorio.ufba.br/ri/handle/ri/16577 |
Issue Date: | 2012 |
Appears in Collections: | Artigo Publicado em Periódico (FIS) |
Files in This Item:
File | Description | Size | Format | |
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H. A. Borges.pdf | 247,96 kB | Adobe PDF | View/Open |
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