Blandford-Znajek jets in MOdified Gravity

TL;DR

This paper investigates black hole jets within Modified Gravity (MOG), deriving new magnetospheric models and analytic solutions that could enable high-precision tests of general relativity in strong gravity regimes.

Contribution

It introduces novel magnetospheric models in Kerr-MOG backgrounds and provides explicit analytic solutions for magnetic fields around static MOG black holes.

Findings

Magnetospheres depend non-trivially on MOG parameters.

Analytic solutions are expressed as Heun polynomials.

Potential for high-precision tests of GR using MOG models.

Abstract

General relativity (GR) will be imminently challenged by upcoming experiments in the strong gravity regime, including those testing the energy extraction mechanisms for black holes. Motivated by this, we explore magnetospheric models and black hole jet emissions in MOdified Gravity (MOG) scenarios. Specifically, we construct new power emitting magnetospheres in a Kerr-MOG background which are found to depend non-trivially on the MOG deformation parameter. This may allow for high-precision tests of GR. In addition, a complete set of analytic solutions for vacuum magnetic field configurations around static MOG black holes are explicitly derived, and found to comprise exclusively Heun polynomials.