Frame-dragging effects on magnetic fields near a rotating black hole

TL;DR

This paper explores how frame dragging near a rotating black hole affects magnetic field configurations, revealing significant differences based on field alignment and introducing new analyses of electric and magnetic surfaces.

Contribution

It provides a novel analysis of magnetic field behavior influenced by frame dragging in Kerr black holes, including the construction of electric and magnetic surface structures.

Findings

Magnetic null points can develop near the ergosphere.

Aligned and inclined magnetic fields exhibit different behaviors.

New surfaces of equal electric and magnetic intensities are constructed.

Abstract

We discuss the role of general relativity frame dragging acting on magnetic field lines near a rotating (Kerr) black hole. Near ergosphere the magnetic structure becomes strongly influenced and magnetic null points can develop. We consider aligned magnetic fields as well as fields inclined with respect to the rotation axis, and the two cases are shown to behave in profoundly different ways. Further, we construct surfaces of equal values of local electric and magnetic intensities, which have not yet been discussed in the full generality of a boosted rotating black hole.