Termodinâmica causal de um modelo de colapso gravitacional para um fluido anisotrópico com fluxos dissipativos

Abstract

We present in this work a hydrodynamic and thermodynamic treatment of a radiant star model undergoing dissipative gravitational collapse, from a certain initial configuration until it becomes a black hole. The collapsing star consists of a non-perfect fluid,where we explore the consequences of including viscous pressures, both shear and bulk,as well as a radial heat flow. We analyze the temporal evolution of the heat flux, mass function, luminosity perceived by an observer at infinity and the effective surface temperature. It is shown that this simple exact model, satisfying all the energy conditions throughout the interior region of the star and throughout the collapse process, provides a physically reasonable behavior for the temperature profile within the framework of extended irreversible thermodynamics.