Publicação: Λ(t) cosmology induced by a slowly varying Elko field
Carregando...
Arquivos
Data
Orientador
Coorientador
Pós-graduação
Curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Editor
Tipo
Resenha
Direito de acesso
Acesso aberto
Resumo
In this work the exact Friedmann-Robertson-Walker equations for an Elko spinor field coupled to gravity in an Einstein-Cartan framework are presented. The torsion functions coupling the Elko field spin-connection to gravity can be exactly solved and the FRW equations for the system assume a relatively simple form. In the limit of a slowly varying Elko spinor field there is a relevant contribution to the field equations acting exactly as a time varying cosmological model Λ(t) = Λ∗ + 3βH2, where Λ∗ and β are constants. Observational data using distance luminosity from magnitudes of supernovae constraint the parameters Ωm and β, which leads to a lower limit to the Elko mass. Such model mimics, then, the effects of a dark energy fluid, here sourced by the Elko spinor field. The density perturbations in the linear regime were also studied in the pseudo-Newtonian formalism.
Descrição
Palavras-chave
Cosmology of theories beyond the SM, Dark energy theory, Supernova type Ia - standard candles
Idioma
Inglês
Como citar
Journal of Cosmology and Astroparticle Physics, v. 2017, n. 1, 2017.
