Bulk Viscous Solutions to the Field Equations and the Deceleration Parameter-Revisited

Details Bulk Viscous Solutions to the Field Equations and the Deceleration Parameter-Revisited Bulk Viscous Solutions to the Field Equations and the Deceleration Parameter-Revisited

2002-07-04

arxiv.org/abs/gr-qc/0207023v1

Int.J.Mod.Phys. D11 (2002) 1419-1434

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Latex 15 pages, submitted to IJMPD

Scientific paper

10.1142/S0218271802002402

We utilise a form for the Hubble parameter to generate a number of solutions to the Einstein field equations with variable cosmological constant and variable gravitational constant in the presence of a bulk viscous fluid. The Hubble law utilised yields a constant value for the deceleration parameter. A new class of solutions is presented in the Robertson-Walker spacetimes. The coefficient of bulk viscosity is assumed to be a power function of the mass density. For a class of solutions, the deceleration parameter is negative which is consistent with the supernovae Ia observations.

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