Dissipative gravitational collapse of an (an)isotropic star

Abstract

We develop a framework to study the effects of pressure anisotropy on the evolution of a collapsing star dissipating energy in the form of radial heat flux. In this construction, the star begins its collapse from an initial static configuration described by Paul and Deb (Astrophys. Space Sci. 354:421, 2014) solution in the presence (or absence) of anisotropic stresses. The form of the initial static solution, which is a generalization of Pant and Sah (Phys. Rev. D 32:1538, 1985) model, complies with all the requirements of a realistic star and provides a simple method to analyze the impacts of anisotropy onto the collapse.