Properties of black holes in non-linear electrodynamics

TL;DR

This paper explores charged black holes in nonlinear electrodynamics, revealing unique horizon properties, stable light-rings, and longer-lived quasinormal modes compared to classical solutions.

Contribution

It presents new analytic solutions for charged black holes in nonlinear electrodynamics and analyzes their horizon and quasinormal mode properties.

Findings

Existence of stable light-rings and trapped photon orbits.

Presence of additional quasinormal mode branches longer lived than Einstein's.

Modifications near the horizon are hidden from distant observers.

Abstract

We investigate the properties of charged black hole geometries in nonlinear electrodynamics. We focus on the recently reported analytic charged black hole solutions to illustrate the consequences of a non-monotonic lapse function that exists for a wide range of black hole solutions. The spacetime admits stable light-rings, static near-horizon observers, and trapped near horizon photon orbits. We also show that although these modifications near the horizon are screened from afar, they nonetheless lead to additional branches of quasinormal modes for the black hole that are longer lived than the canonical Einstein branches.