On Friedmann–Robertson–Walker model in conformal teleparallel gravity

The European Physical Journal C

J. G. Silva¹  S. C. Ulhoa¹  A. F. Santos² 

[1] Instituto de Física, International Center of Condensed Matter Physics Universidade de Brasília, 70910-900, Brasília, DF, Brazil;Instituto de Física, Universidade Federal de Mato Grosso, Cuiabá, 78060-900, Mato Grosso, Brazil;Department of Physics and Astronomy, University of Victoria, 3800 Finnerty Road, Victoria, BC, Canada;

关键词: Scalar Field;    Field Equation;    Conformal Transformation;    Lagrangian Density;    Deceleration Parameter;   

DOI  :  10.1140/epjc/s10052-016-4023-y

来源: Springer

【 摘 要 】

In this paper we use the conformal teleparallel gravity to study an isotropic and homogeneous Universe which is settled by the Friedmann–Robertson–Walker metric. The conformal symmetry demands the existence of a scalar field which works as a dark field for this model. We solve numerically the field equations then we obtain the behavior of some cosmological parameters such as the scale factor, the deceleration parameter and the energy density of the perfect fluid which is the matter field of our model. The field equations, which we called modified Friedmann equations, allow us to define a dark fluid, with dark energy density and pressure, responsible for the acceleration in the Universe, once we defined an equation of state for the dark fluid.

【 授权许可】

CC BY