General Mathematics

    

A New Class of LRS Bianchi Type VI0 Universes with Free Gravitational Field and Decaying Vacuum Energy Density

Authors: Anirudh Pradhan, Shyam Sundar Kumhar, Padmini Yadav, Kanti Jotania

A new class of LRS Bianchi type VI0 cosmological models with free gravitational elds and a variable cosmological term is investigated in presence of perfect uid as well as bulk viscous uid. To get the deterministic solution we have imposed the two dierent conditions over the free gravitational elds. In rst case we consider the free gravitational eld as magnetic type whereas in second case `gravitational wrench' of unit `pitch" is supposed to be present in free gravitational eld. The viscosity coecient of bulk viscous uid is assumed to be a power function of mass density. The eect of bulk viscous uid distribution in the universe is compared with perfect uid model. The cosmological constant is found to be a positive decreasing function of time which is corroborated by results from recent observations. The physical and geometric aspects of the models are discussed.

Comments: 16 Pages.

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Submission history

[v1] 2014-05-07 23:45:52

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