Plane-Symmetric Inhomogeneous Bulk Viscous Cosmological Models with Variable $\Lambda$

TL;DR

This paper develops a plane-symmetric, inhomogeneous, and anisotropic cosmological model with bulk viscosity, deriving a time-varying cosmological constant without ad hoc assumptions, and discusses its physical and geometric properties.

Contribution

It presents a novel inhomogeneous, anisotropic cosmological model with bulk viscosity and a decreasing cosmological constant derived from fundamental equations.

Findings

Cosmological constant decreases over time

Model exhibits inhomogeneity and anisotropy

Includes gravitationally radiative cases

Abstract

A plane-symmetric non-static cosmological model representing a bulk viscous fluid distribution has been obtained which is inhomogeneous and anisotropic and a particular case of which is gravitationally radiative. Without assuming any {\it adhoc} law, we obtain a cosmological constant as a decreasing function of time. The physical and geometric features of the models are also discussed.