Fivedimensional cosmological models with viscous fluid in Wesson's theory.
Abstract
The implications of the restmassvarying theory of gravity proposed by Wesson (1983) for homogeneous anisotropic fivedimensional cosmological models containing a fluid with bulk viscosity are investigated theoretically. Solutions are obtained for an equation of state p = (lambda)(rho) with lambda = 1 (stifffluid), 0 (matterdominated), or 1/3 (radiationdominated) and shown to be generalizations of the results of Gron (1985 and 1988) for the case of a perfect fluid. In these models, spontaneous compactification of the extra dimension (isotropization) is observed, and the presently observed invariance of the rest mass of an isolated particle is attributed to a decrease in the rate of restmass change with time.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 June 1990
 Bibcode:
 1990A&A...232..305B
 Keywords:

 Astronomical Models;
 Computational Astrophysics;
 Cosmology;
 Viscous Fluids;
 Gravitation Theory;
 Matter (Physics);
 Astrophysics