A stable flat universe with variable cosmological constant in f (R, T) gravity

被引：23

作者：

Ahmed, Nasr ^{[1
]}

Alamri, Sultan Z. ^{[2
]}

机构：

[1] Natl Res Inst Astron & Geophys, Astron Dept, Cairo, Egypt

[2] Taibah Univ, Fac Sci, Math Dept, Medina, Saudi Arabia

来源：

RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2018年 / 18卷 / 10期

关键词：

modified gravity; cosmology; deceleration parameter; PROBE WMAP OBSERVATIONS; DARK ENERGY; EQUATION; LAMBDA; MODEL; CONSEQUENCES; CONSTRAINTS; SUPERNOVAE; COMPONENT; MAPS;

D O I：

10.1088/1674-4527/18/10/123

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper, a general FRW cosmological model has been constructed in f(R,T) gravity reconstruction with variable cosmological constant. A number of solutions to the field equations has been generated by utilizing a form for the Hubble parameter that leads to Berman's law of constant deceleration parameter q = m - 1. The possible decelerating and accelerating solutions have been investigated. For (q > 0) we get a stable flat decelerating radiation-dominated universe at q =1. For (q < 0) we get a stable accelerating solution describing a flat universe with positive energy density and negative cosmological constant. Nonconventional mechanisms that are expected to address the late-time acceleration with negative cosmological constant have been discussed.

引用

页数：10

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