EARLY HOMOGENEOUS UNIVERSE WITH VARIABLE COSMOLOGICAL CONSTANT: KINEMATICS TESTS

Author:

SINGH C. P.1

Affiliation:

1. Department of Applied Mathematics, Delhi College of Engineering, Bawana Road, Delhi-110 042, India

Abstract

A spatially homogeneous cosmological model with flat geometry filled with perfect fluid is studied in the presence of a variable cosmological "constant." Einstein's field equations are solved by using the "gamma-law" equation of state p = (γ-1)ρ, where the adiabatic parameter γ, varies with cosmic time. The functional form of γ, which is assumed to be the function of scale factor R as proposed by Carvalho, is used to describe the early evolution of universe with variable cosmological "constant." A unified description of early universe is given in which an inflationary phase is followed by radiation-dominated phase. It has been observed that the solutions are compatible with the result of recent observations. Exact expressions for the look-back time, proper distance, luminosity distance and angular diameter distance versus redshift are derived and their meaning are discussed in detail. The various physical aspects of the models are also discussed.

Publisher

World Scientific Pub Co Pte Lt

Subject

Astronomy and Astrophysics,Nuclear and High Energy Physics,Atomic and Molecular Physics, and Optics

Cited by 4 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Inhomogeneous early viscous fluid universe: A concrete model for dark energy;International Journal of Geometric Methods in Modern Physics;2016-03-31

2. Bianchi type i cosmological model with varying G, Λ & σ2in VSL theory;Journal of Dynamical Systems and Geometric Theories;2015-07-03

3. Kaluza-Klein Type Cosmological Model of Early Universe with Variable Cosmological Term Λ: Kinematic Tests;International Journal of Theoretical Physics;2009-08-04

4. Early Universe in Scalar-Tensor Theory;International Journal of Theoretical Physics;2008-02-05

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