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Mohamad Reza Setare

Mohamad Reza Setare

Academic rank: Professor
ORCID:
Education: PhD.
ScopusId: 7003669033
Faculty: Faculty of Science
Address:
Phone: 08716660075

Research

Title
Dark energy and viscous cosmology with variable G and lambda in an anisotropic background
Type
JournalPaper
Keywords
Dark energy, viscous cosmology
Year
2013
Journal Canadian Journal of Physics
DOI
Researchers Vahid Fayaz ، Mohamad Reza Setare ، Hossein Hosseinkhani

Abstract

The general Bianchi type I with dark energy in the form of standard and modified Chaplygin gas with variable G and lamda and bulk viscosity have been investigated. The de Sitter, power-law and general exponential solutions are assumed for the scale factor in each spatial direction and the corresponding cosmological models are reconstructed. Moreover, for the general exponential solutions, from which the de Sitter and power-law solutions may be obtained, we obtain models that reproduce the early universe, assumed as the inflation, and the late time accelerated expanding universe, that which yields a constant value for the deceleration parameter. We reconstruct bulk viscosity, gravitational parameter, G, cosmological term, density parameter, cosmological constant density parameter, and deceleration parameter, q, for different equations of state. In the large time limit the model describes an accelerating universe wherein the effective negative pressure induced by Chaplygin gas and bulk viscous pressure are driving the acceleration.