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Turkish Journal of Physics

DOI

10.3906/fiz-1007-2

Abstract

This paper presents cosmological models in which the gravitational and cosmological constants G and \Lambda are time-dependent. We find a variety of solutions for the variation of cosmological parameters. It is also found that, in the case of matter dominated Robertson-Walker Universe, if the cosmological constant \Lambda \ne 0, the Hubble's constant H is not constant at all but inversely proportional to the cosmic time. The conservation law for the energy momentum tensor is still valid with our law of variation: \Lambda \propto R^{-2} and G\rho \propto \frac{\Lambda }{8\pi}.

Keywords

Cosmology, cosmological model, homogeneous isotropic, cosmic time, variable cosmological constant

First Page

173

Last Page

180

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