Nonlocal Equation of State in General Relativistic Radiating Spheres

TL;DR

This paper explores nonlocal equations of state in general relativistic radiating spheres, revealing conditions under which such matter distributions can exist and collapse, supported by analytical and numerical models.

Contribution

It introduces a nonlocal equation of state for relativistic spheres and demonstrates their physical viability and collapse behavior through models.

Findings

Existence of nonlocal equations of state in relativistic spheres

Models satisfy energy conditions for anisotropic fluids

Configurations collapse as radiating anisotropic spheres

Abstract

We show that under particular circumstances a general relativistic spherically symmetric bounded distribution of matter could satisfy a nonlocal equation of state. This equation relates, at a given point, the components of the corresponding energy momentum tensor not only as function at that point, but as a functional throughout the enclosed configuration. We have found that these types of dynamic bounded matter configurations, with constant gravitational potentials at the surface, admit a Conformal Killing Vector and fulfill the energy conditions for anisotropic imperfect fluids. We also present several analytical and numerical models satisfying these equations of state which collapse as reasonable radiating anisotropic spheres in general relativity.