Mathematical Formalism in Cosmological Models of Gravity
DOI:
https://doi.org/10.5433/1679-0375.2016v37n2p59Keywords:
perfect gas law, perfect fluid, coupling constant, expanding universeAbstract
We analyze solutions to Friedmann-Robertson-Walker cosmologies in Brans-Dicke theory, where a scalar field is coupled to gravity. The cosmological solutions of Brans-Dicke theory, characterized by a decaying vacuum energy density and by a constant relative matter density, considering Robertson-Walker universe, exact solutions have been obtained in Brans-Dicke cosmology in absence of term ? cosmological. Matter is modelled by a ?-law perfect fluid, including vacuum energy as a special case. The properties of homogeneity and isotropy, the cosmological principle requires that the contents of universal matter are described as a perfect fluid, for which if an assumed energy-momentum tensor. Therefore, our goal is to find the equations that govern the dynamics of this content in an inflationary universe.Downloads
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