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Bulk viscous cosmological model in f(R, T) theory of gravity

Author:
Debnath, Partha Sarathi  


Journal:
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS


Issue Date:
2019


Abstract(summary):

In this paper, we have presented bulk viscous cosmological model of the universe in the modified gravity theory in which the Lagragian of the gravitational action contains a general function f(R, T), where R and T denote the curvature scalar and the trace of the energy momentum tensor, respectively, in t he framework of a flat Friedmann Robertson-Walker model with isotropic fluid. We obtain cosmological solution in f(R, T) theory of gravity, specially of particular choice f(R, T) =3D R+2 lambda T, where lambda is a constant, in the presence of bulk viscosity that are permitted in Eckart theory, Truncated Israel Stew art (TIS) theory and Full Israel Stew art (FIS) theory. The physical and geometrical properties of the models in Eckart, TIS theory and FIS theory are studied in detail. The analysis of the variation of bulk viscous pressure, energy density, scale factor, Hubble parameter and deceleration parameter with cosmic evolution is done in the respective theories. The models are analyzed by comparison with recent observational data. The cosmological models are compatible with observations.


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