FIZIKA B 19 (2010) 4 , 193-200
A COSMOLOGICAL MODEL WITH VARYING G AND Λ TERM IN GENERAL RELATIVITY
R. K. TIWARIa, S. S. TIWARIa and P. PANDEYb
aDepartment of Mathematics, Government Model Science College, Rewa (M.P.), India
bDepartment of Physics, Government Model Science College, Rewa (M.P.), India
Received 21 February 2009; Revised manuscript received 3 April 2010
Accepted 17 November 2010 Online 8 March 2011
Einstein's field equations with variable gravitational constant
and cosmological constants are considered in the presence of
perfect fluid for Bianchi type-I universe by assuming the
cosmological term proportional to R−m (R is scale factor
and m is a constant). The model approaches quasi-isotropic state.
The cosmological term decreases with increasing time.
We obtain that the present universe is accelerating with a large
fraction of cosmological density in the from of cosmological term.
PACS number: 98.80.-k
Keywords: cosmology, Bianchi type-I universe, variable cosmological term