EARLY COSMOLOGICAL MODELS WITH BULK VISCOSITY IN BRANS-DICKE THEORY

Authors
RAM S SINGH CP
Citation
S. Ram et Cp. Singh, EARLY COSMOLOGICAL MODELS WITH BULK VISCOSITY IN BRANS-DICKE THEORY, Astrophysics and space science, 254(1), 1997, pp. 143-150
Citations number
13
Journal title
Astrophysics and space science → ACNP
ISSN journal
0004640X
Volume
254
Issue
1
Year of publication
1997
Pages
143 - 150
Database
ISI
SICI code
0004-640X(1997)254:1<143:ECMWBV>2.0.ZU;2-Y
Abstract
The effect of time dependent bulk viscosity on the evolution of Friedm ann models with zero curvature in Brans-Dicke theory is studied. The s olutions of the held equations with 'gamma-law' equation of state p = (gamma-1)rho, where gamma varies continuously as the Universe expands, are obtained by using the power-law relation phi = bR(n), which lead to models with constant deceleration parameter. We obtain solutions fo r the inflationary period and radiation dominated era of the universe. The physical properties of cosmological solutions are also discussed.