Original scientific paper
Spherically-symmetric nonsingular models with variable L term in relativistic cosmology
Anirudh Pradhan
; Department of Mathematics, Hindu Post-Graduate College, Zamania-232 331, Ghazipur, India
Kashika Srivastava
; Department of Mathematics, Hindu Post-Graduate College, Zamania-232 331, Ghazipur, India
R. P. Singh
; Department of Mathematics, T. D. Post-Graduate College, Jaunpur- 222 002, India
Abstract
We discuss a class of nonsingular spherically-symmetric cosmological models with radial heat flux and variable cosmological term Λ(t). Three different exact solutions of the Einstein’s field equations are obtained for both perfect fluid and fluid with bulk viscosity. It turns out that the cosmological term Λ(t) is a decreasing function of time, what is consistent with recent observations of type Ia supernovae.
Keywords
cosmology; variable cosmological term; nonsingular models; bulk viscosity
Hrčak ID:
304369
URI
Publication date:
2.8.2006.
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