Black Holes with Abelian and Non-Abelian Charges and Their Impact on Matter Accretion Flows

TL;DR

This paper explores how non-Abelian charges from a modified Yang-Mills theory alter black hole structures and significantly influence matter accretion flows, providing new insights into astrophysical black hole behavior.

Contribution

It introduces a novel class of modified Reissner-Nordström black holes with non-Abelian charges and analyzes their impact on accretion processes and related astrophysical phenomena.

Findings

Yang-Mills charge affects the event horizon and stable orbits.

Accretion efficiency improves with negative Yang-Mills charge.

Analytical and numerical results show increased mass accretion rates.

Abstract

We study the black hole spacetime structure of a model consisting of the standard Maxwell theory and a $p$-power-Yang-Mills term. This non-linear contribution introduces a non-Abelian charge into the global solution, resulting in a modified structure of the standard Reissner-Nordstr\"{o}m black hole. Specifically, we focus on the model with $p=1/2$, which gives rise to a new type of modified Reissner-Nordstr\"{o}m black hole. For this class of black holes, we compute the event horizon, the innermost stable circular orbit, and the conditions to preserve the weak cosmic censorship conjecture. The latter condition sets a well-established relation between the electric and the Yang-Mills charges. As a first astrophysical implication, the accretion properties of spherical steady flows are investigated in detail. Extensive numerical examples of how the Yang-Mills charge affects the accretion process of an isothermal fluid in comparison to the standard Reissner-Nordstr\"{o}m and Schwarzschild black holes are displayed. Finally, analytical solutions in the fully relativistic regime, along with numerical computations, of the mass accretion rate for a polytropic fluid in terms of the electric and Yang-Mills charges are obtained. As a main result, the mass accretion rate efficiency is considerably improved, with respect to the standard Reissner-Nordstr\"{o}m and Schwarzschild solutions, for negative values of the Yang-Mills charge.