Abstract
This paper is devoted to explore the cosmic evolution of non-flat Friedmann Robertson Walker universe through generalized ghost pilgrim dark energy model in the background of f(R) gravity. For this purpose, we consider two well known scale factors, i.e., power-law and unified scale factors in terms of red shift parameter. For these scale factors, we reconstruct the given dark energy model in f(R) gravity and determine its stability/instability through squared speed of sound parameter. In order to discuss the behavior of reconstructed and dark energy models, we evaluate well known cosmological parameter such as equation of state parameter along with omega –omega ' plane. In addition to this, we also investigate compatibility of new models with standard cosmological models through state-finder parameters. The density parameter is formulated for both ordinary matter as well as dark energy components and results are compared with Planck 2018 constraints. It is concluded that cosmological parameters reveal consistency with recent observations while the value of density parameter suggested by Planck 2018 is achieved by power-law scale factor in most of the cases as compared to unified scale factor.
Highlights
Cosmological constant is the simplest candidate to explaindark energy (DE) phenomenon the cosmological constant model ( C D M) is consistent with current observations
What is the reason behind the fact that vacuum energy is less than its estimated amount? In order to inspect the issue, two versatile approaches were adopted, one of which is the modification in geometric part of Einstein–Hilbert action
In order to determine the stability/instability of reconstructed GGPDE f (R) models, we have considered squared speed of sound parameter
Summary
DE phenomenon the cosmological constant model ( C D M) is consistent with current observations. In the background of quantum gravity, Holographic DE (HDE) model have been proposed on the basis of Holographic principal [5] the energy density of which is given by μd. The proposal of Veneziano ghost DE (ρ = α H , where α is a constant having dimension [energy]3) lies in the category of dynamical DE models which plays a crucial role in the accelerated expansion of the universe [6,7]. The incentive of this model comes from Veneziano ghost of quantum chromodynamics (QCD) that is beneficial to solve U (1) problem in QCD. The fundamental characteristic of this model is that Veneziano ghost (being unphysical in quantum field theory development in the Minkowski spacetime) gives non-trivial physical impacts in Friedmann Robertson–Walker (FRW) universe [8]
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