Cosmological models with viscous fluid and time- dependent equation of state in Wesson's theory

Details Cosmological models with viscous fluid and time- dependent equation of state in Wesson's theory Cosmological models with viscous fluid and time- dependent equation of state in Wesson's theory

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ap%26ss.310...77k&link_type=abstract

Astrophysics and Space Science, Volume 310, Issue 1-2, pp. 77-80

Astronomy and Astrophysics

Astrophysics

Cosmology, Wesson&Rsquo, S Theory, Variable Rest Mass, Time-Dependent Equation Of State

Scientific paper

Assuming the time-dependent equation of state p=λ(t)ρ, five dimensional cosmological models with viscous fluid for an open universe (k=-1) and flat universe (k=0) are presented. Exact solutions in the context of the rest mass varying theory of gravity proposed by Wesson (Astron. Astrophys. 119, 145, 1983) are obtained. It is found that the phenomenon of isotropisation takes place in this theory, i.e. the mass scale factor A(t) which characterizes the rest mass of a typical particle is evolving with cosmic time just as the spatial scale factor R(t). It is further found that rest mass is approximately constant in the present universe.

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