Journal ArticleDOI
Brans-Dicke static universes
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In this paper, the authors study flat and nonflat static models obeying the Brans-Dicke theory and RW metric, including the case which considers Bertolami's time-dependent cosmological term.Abstract:
We study flat and nonflat static models obeying the Brans-Dicke theory and RW metric, including the case which considers Bertolami's time-dependent cosmological term. We find several solutions where the density remains constant, while the gravitational constant varies with time.read more
Citations
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Journal ArticleDOI
Early viscous universe with variable gravitational and cosmological ‘constants’
TL;DR: In this paper, a unified description of the early evolution of universe is presented with a number of possible assumptions on the bulk viscous term and cosmological constant in which an inflationary phase is followed by radiation-dominated phase.
Journal ArticleDOI
Cosmological models with variable gravitational and cosmological “constants”
TL;DR: In this paper, the authors considered the Einstein field equations with perfect fluid source and variable Λ andG for the Robertson-Walker metric and found perfect gas equation of state models in the Euclidean and non-Euclidean cases.
Journal ArticleDOI
Some FRW models with variable G and
TL;DR: In this article, the authors considered the field equations with G and both varying with time are considered in the context of general homogeneous, isotropic universes in a way which conserves the energy momentum tensor of the matter content.
Journal ArticleDOI
Brans-Dicke models with time-dependent cosmological term
Marcelo Samuel Berman,M. M. Som +1 more
TL;DR: More general solutions than those presented by Bertolami are deduced in the Brans-Dicke cosmology, endowed with a time-dependent cosmological term, for a Robertson-Walker metric and a perfect fluid obeying the perfect gas law of state.
Journal ArticleDOI
Static Universe in a Modified Brans-Dicke Cosmology
TL;DR: In this paper, a static model of the universe was derived by means of the Endo-Fukui modified Brans-Dicke theory, where density and pressure are constant, but the gravitational constant and cosmological term vary with time.
References
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Journal ArticleDOI
Time-dependent cosmological term
TL;DR: In this article, a Brans-Dicke theory with a scalar-field-dependent cosmological term is considered and solutions of the field equations in a homogeneous and isotropic space-time are obtained and discussed.
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