Cosmological Implications of the Generalized Entropy Based Holographic Dark Energy Models in Dynamical Chern-Simons Modified Gravity

M. Younas; Abdul Jawad; Saba Qummer; H. Moradpour; Shamaila Rani

paper

Cosmological Implications of the Generalized Entropy Based Holographic Dark Energy Models in Dynamical Chern-Simons Modified Gravity

arXiv:1901.01311

Abstract

Recently, Tsallis, Rényi and Sharma-Mitall and entropies have widely been used to study the gravitational and cosmological setups. We consider a flat FRW universe with linear interaction between dark energy and dark matter. We discuss the dark energy models using Tsallis, Rényi and Sharma-Mitall entropies in the framework of Chern-Simons modified gravity. We explore various cosmological parameters (equation of state parameter, squared sound of speed ) and cosmological plane ( $ω_{d} - ω_{d}^{'}$ , where $ω_{d}^{'}$ , is the evolutionary equation of state parameter). It is observed that the equation of state parameter gives quintessence-like nature of the universe in most of the cases. Also, the squared speed of sound shows stability of the models for Tsallis, Rényi dark energy model while unstable behavior for Sharma-Mitall dark energy model. The $ω_{d} - ω_{d}^{'}$ plane represents the thawing region for all dark energy models.

19 pages, 9 figures, to appear in AHEP