Conformally symmetric Friedmann–Robertson–Walker metric in f(R,T) gravity

Abstract

In this paper, conformal symmetric Freidmann–Robertson–Walker (FRW) universe with perfect fluid in the framework of [Formula: see text] gravitational theory is investigated. Firstly, field equations of FRW universe with perfect fluid are obtained for [Formula: see text] modified theory of gravity. The field equations of the model have been revised to understand physical nature between matter and geometry by means of conformal symmetry in [Formula: see text] gravitational theory. The exact solutions of conformal FRW universe with perfect fluid are attained for matter part of the [Formula: see text] model in the case of [Formula: see text]. The [Formula: see text] gravitational theory is one of the acceptable modifications of General Relativity (GR) in order to expound cosmic acceleration of the universe with no needing any exotic component. Nevertheless, the obtained model indicates exotic matter distribution for the current selection of arbitrary constants. Also, different value selections of arbitrary constants for the obtained model are able to predicate expanding or contracting universe with zero deceleration. Besides, it is shown that the FRW universe under the influence of the conformal Killing vector preserves to isotropic nature. Energy conditions are investigated. Also, it is shown that the constructed model satisfies strong energy condition (SEC) in all cases.

Slow-roll inflation in f(R,T) gravity and a modified Starobinsky-like inflationary model

“…In this work we will assume that f (R, T ) = R + 2καT , where α is a real constant. This is the most studied model of f (R, T ) gravity and its viability has been investigated in numerous works [27][28][29][30][31][32][33][34][35][36][37][38][39][40]. In this particular model, the action of gravity reads,…”

“…Furthermore, we can find a continuity equation for ρ through a similar procedure that gave us equation (11). By taking a time derivative on (33) and replacing (35), we obtain the modified Klein-Gordon equation,…”

Scalar Field Models of Barrow Holographic Dark Energy in f(R,T) Gravity

“…This theory also recommends precise field equations for the issues of distinct matter research. Multiple models in this hypothesis [66][67][68][69][70][71][72] can correspond the different choices of functional forms in the f (R, T) theory.…”

The Friedmann Robertson Walker Space time in Lyra Geometry

“…In the modified theories of general relativity, FRW space time was studied in different aspects. Taser [7] tensor gravity was analyzed by Kolitch and Eardley [11]. Holden et al [12] presented a phase-plane analysis of FRW cosmologies in Brans-Dicke gravity.…”