Radiating fluid sphere immersed in an anisotropic atmosphere

TL;DR

This paper models a radiating star's gravitational collapse with heat flux, considering an inhomogeneous anisotropic atmosphere with strings, and shows that inhomogeneities enhance relaxational effects in heat transport.

Contribution

It extends previous models by incorporating inhomogeneous string density in the exterior spacetime of a radiating star during collapse.

Findings

Inhomogeneities increase relaxational effects in heat transport.

The model generalizes constant string density atmospheres to inhomogeneous cases.

Relaxational effects are enhanced due to string density inhomogeneities.

Abstract

We model a radiating star undergoing dissipative gravitational collapse in the form of radial heat flux. The exterior of the collapsing star is described by the generalised Vaidya solution representing a mixture of null radiation and strings. Our model generalises previously known results of constant string density atmosphere to include inhomogeneities in the exterior spacetime. By utilising a causal heat transport equation of the Maxwell-Cattaneo form we show that relaxational effects are enhanced in the presence of inhomogeneities due to the string density.