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Late-time acceleration from ekpyrotic bounce in f(Q,T) gravity

Authors :
A. R. Lalke
G. P. Singh
A. Singh
Source :
International Journal of Geometric Methods in Modern Physics. 20
Publication Year :
2023
Publisher :
World Scientific Pub Co Pte Ltd, 2023.

Abstract

In this paper, we investigate the late-time accelerated universe evolution in a flat, homogeneous and isotropic model in the context of [Formula: see text] gravity, where [Formula: see text] and [Formula: see text] are non-metricity scalar and trace of energy–momentum tensor, respectively. The scale factor, by construction, yields ekpyrotic contraction era followed by a non-singular bounce. The expanding era of the universe yields late-time dark energy era preceded by matter-dominating decelerating era. The model unifies an ekpyrotic, non-singular bounce with the present dark energy-dominated epoch. The model parameters in the functional form of [Formula: see text] gravity affect the dynamical evolution of the equation of state (EoS) parameter. The theoretical value of EoS parameter is found to be [Formula: see text] for [Formula: see text], respectively, and it lies in range of the estimated value of EoS parameter from the Planck+SNe+BAO observational data. Different aspects of this bouncing model including behavior of geometrical and physical quantities along with energy conditions have been discussed in detail.

Details

ISSN :
17936977 and 02198878
Volume :
20
Database :
OpenAIRE
Journal :
International Journal of Geometric Methods in Modern Physics
Accession number :
edsair.doi...........a4b6ed5e944a75373b8c4a0fbdd8ecc2
Full Text :
https://doi.org/10.1142/s0219887823501311