A cosmological scenario from the Starobinsky model within the (, ) formalism
Nenhuma Miniatura disponível
Data
2019-01-01
Autores
Moraes, P. H.R.S.
Sahoo, P. K.
Ribeiro, G. [UNESP]
Correa, R. A.C.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
In this paper we derive a novel cosmological model from the (, ) theory of gravitation, for which is the Ricci scalar and is the trace of the energy-momentum tensor. We consider the functional form (, ) = ()+(), with () being the Starobinsky Model, named + 2, and () = 2, with and being constants. We show that a hybrid expansion law form for the scale factor is a solution for the derived Friedmann-like equations. In this way, the model is able to predict both the decelerated and the accelerated regimes of expansion of the universe, with the transition redshift between these stages being in accordance with recent observations. We also apply the energy conditions to our material content solutions. Such an application makes us able to obtain the range of acceptability for the free parameters of the model, named and .
Descrição
Palavras-chave
Como citar
Advances in Astronomy, v. 2019.