Acceleration in Friedmann cosmology with torsion
Carregando...
Arquivos
Fonte externa
Fonte externa
Data
Orientador
Coorientador
Pós-graduação
Curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Editor
Tipo
Artigo
Direito de acesso
Arquivos
Fonte externa
Fonte externa
Resumo
A Friedmann like cosmological model in Einstein–Cartan framework is studied when the torsion function is assumed to be proportional to a single ϕ(t) function coming just from the spin vector contribution of ordinary matter. By analysing four different types of torsion function written in terms of one, two and three free parameters, we found that a model with ϕ(t) = - αH(t) (ρm(t) / ρc) n is totally compatible with recent cosmological data, where α and n are free parameters to be constrained from observations, ρm is the matter energy density and ρc the critical density. The recent accelerated phase of expansion of the universe is correctly reproduced by the contribution coming from torsion function, with a deceleration parameter indicating a transition redshift of about 0.65.
Descrição
Palavras-chave
Idioma
Inglês
Citação
European Physical Journal C, v. 79, n. 11, 2019.
