Role of deceleration parameter and interacting dark energy in singularity avoidance

被引：45

作者：

Abdussattar ^{[1
]}

Prajapati, S. R. ^{[1
]}

机构：

[1] Banaras Hindu Univ, Fac Sci, Dept Math, Varanasi 221005, Uttar Pradesh, India

来源：

ASTROPHYSICS AND SPACE SCIENCE | 2011年 / 331卷 / 02期

关键词：

Time-dependent cosmological constant; Vacuum energy; Deceleration parameter; Singularity avoidance; PROBE WMAP OBSERVATIONS; CONSTRAINTS;

D O I：

10.1007/s10509-010-0461-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A class of non-singular bouncing FRW models are obtained by constraining the deceleration parameter in the presence of an interacting dark energy represented by a time-varying cosmological constant. The models being geometrically closed, initially accelerate for a certain period of time and decelerate thereafter and are also free from the entropy and cosmological constant problems. Taking a constant of integration equal to zero one particular model is discussed in some detail and the variation of different cosmological parameters are shown graphically for specific values of the parameters of the model. For some specific choice of the parameters of the model the ever expanding models of Ozer & Taha and Abdel-Rahman and the decelerating models of Berman and also the Einstein de-Sitter model may be obtained as special cases of this particular model.

引用

页码：657 / 663

页数：7

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