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

被引:21
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
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
收藏
页数:10
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