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

被引：0

作者：

Nasr Ahmed ^{[1
]}

Sultan ZAlamri ^{[2
]}

机构：

[1] Astronomy Department, National Research Institute of Astronomy and Geophysics

[2] Mathematics Department, Faculty of Science, Taibah University

来源：

Research in Astronomy and Astrophysics | 2018年 / 18卷 / 10期

关键词：

modified gravity; cosmology; deceleration parameter;

D O I：

暂无

中图分类号：

P159 [宇宙学];

学科分类号：

070401 ;

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

页码：67 / 76

页数：10

共 8 条

[1]

Shapiro I.L,Sola J. Physics Letters B . 2009

[2]

Houndjo M.J.S,Batista C.E.M,Campos J.P,Piattella O.F. Canadian Journal of Physics . 2013

[3]

Xia J.-Q,Cai Y.-F,Li H,Zhang X. Physical Review Letters . 2014

[4]

Landry P,Abdelqader M,Lake K. Phys.Rev.D . 2012

[5]

Cardone.V F,Cardenas R.P,Nodal Y.L. Classical&Quantum Gravity . 2008

[6]

Cai,Y.-F,Saridakis,E.N,Setare,M.R,Xia,J.-Q. Phys.Rep . 2010

[7]

Ratra,B.,Peebles,P.J.E. Phys. Rev. D . 1988

[8]

Zel‘dovich,Y.B. MNRAS . 1972

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