2022/07/05 by R. K. Tiwari, Alnadhief H. A. Alfedeel, Tiwari, Rishi Kumar +7
Physics and Astronomy · Earth and Planetary Sciences · #Cosmology and Gravitation Theories #Geophysics and Gravity Measurements #Black Holes and Theoretical Physics
paper · pdf · doi:10.48550/arxiv.2208.13736
In this paper, we investigate Bianchi type-V cosmological models with bulk viscous fluid and time varying cosmological Λ and Newtonian G parameters. The Einstein's field equations have been transformed into a coupling non-linear, first-order differential equations, and the fourth-order Runge-Kutta method of numerical integration has been used to integrate the differential equations with appropriate initial conditions consistent with current cosmological observations. We show that the model describes a universe that starts off with a negative cosmological term, as well as a matter-dominated and decelerated early epoch that, eventually becomes Λ-dominated and expanding with acceleration, in concordance with current observations.