TITLE:
2-A Cosmological Model with Varying G and ∧ in General Relativity
AUTHORS:
Harpreet, R. K. Tiwari, H. S. Sahota
KEYWORDS:
Bianchi Type-I Universe; Varying G and ∧ ; Cosmology
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.3 No.1B1,
July
11,
2013
ABSTRACT: Spatially homogeneous and anisotropic Cosmological
models play a significant role in the description of the early stages of evolution
of the universe. The problem of the cosmological constant is still unsettled.
The authors recently considered time dependent G and L with Bianchi type–I Cosmological model .We considered in this paper
homogeneous Bianchi type -I space-time with variable G and L containing matter in the form of a perfect fluid assuming the cosmological
term proportional to R-2 (where R is scale factor). Initially the
model has a point type singularity, gravitational constant G (t) is decreasing and cosmological
constant L is infinite at this time. When time
increases L decreases. Unlike
in some earlier works we have neither assumed equation of state nor particular
form of G. The model does not approach isotropy, if ‘t’ is small .The model is quasi-isotropic for large value of ‘t’.