Effects of a transient bulk viscosity on the evolution of FRW universes with decaying vacuum energy.

Details Effects of a transient bulk viscosity on the evolution of FRW universes with decaying vacuum energy. Effects of a transient bulk viscosity on the evolution of FRW universes with decaying vacuum energy.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995injpb..69..431a&link_type=abstract

Indian J. Phys., Part B, Vol. 69B, No. 5, p. 431 - 441

Physics

Universe: Viscosity

Scientific paper

The effects of incorporating a transient bulk viscosity, which is operative during an instantaneous phase transition, into the FRW universes with a vacuum energy decaying according to Chen-Wu ansatz are studied. The presence of vacuum is instrumental in avoiding the initial singularity and liberalizes the choice of initial conditions, thereby giving rise to different possible scenarios. It is found that the Hubble parameter and the energy density suffer a discontinuity in the presence of the transient bulk viscosity, which being the source of such a discontinuity, leads to viscous heating and/or particle production and influences the subsequent evolution.

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