The importance of anisotropy for relativistic fluids with spherical symmetry

TL;DR

This paper demonstrates how an anisotropic spherically symmetric fluid model can incorporate various physical effects like viscosity, electric fields, and heat flow, often without inducing heat flow, enhancing the modeling of relativistic fluids.

Contribution

It introduces a comprehensive effective anisotropic fluid model that includes multiple physical phenomena, expanding the capabilities of relativistic fluid descriptions.

Findings

Effective heat flow can often be avoided in the model.

The model can incorporate pressure anisotropy, viscosity, electric fields, and null fluids.

Enhances the understanding of relativistic fluid behavior with anisotropy.

Abstract

It is shown that an effective anisotropic spherically symmetric fluid model with heat flow can absorb the addition to a perfect fluid of pressure anisotropy, heat flow, bulk and shear viscosity, electric field and null fluid. In most cases the induction of effective heat flow can be avoided.