Nonsingular Spherical Models with a Variable Cosmological term

Details Nonsingular Spherical Models with a Variable Cosmological term Nonsingular Spherical Models with a Variable Cosmological term

2004-08-18

arxiv.org/abs/gr-qc/0408057v2

Fizika B16:141-158,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages, 6 figures, submitted to Fizika B (Zagreb)

Scientific paper

Exact solutions of the Einstein's field equations describing a spherically symmetric cosmological model without a big bang or any other kind of singularity recently obtained by Dadhich and Patel (2000) are revisited. The matter content of the model is a shear-free perfect fluid with isotropic pressure and a radial heat flux. Three different exact solutions are obtained for both perfect fluid and fluid with bulk viscosity. It turns out that the cosmological rerm $\Lambda(t)$ is a decreasing function of time, which is consistent with recent observations of type Ia supernovae.

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