Gravitational synchrotron radiation and Penrose process in STVG theory

TL;DR

This paper investigates the effects of Scalar-Tensor-Vector Gravity (STVG) on black hole physics, revealing enhanced rotation, energy extraction efficiency exceeding 100%, and gravitational radiation analogues in Kerr-MOG black holes.

Contribution

It introduces the analysis of gravitational synchrotron radiation and Penrose process within STVG, highlighting novel effects on black hole rotation and energy extraction capabilities.

Findings

Kerr-MOG black holes can rotate faster than Kerr black holes.

Energy extraction efficiency exceeds 100% in the Penrose process under STVG.

Gravitational radiation intensity is affected by the presence of STVG.

Abstract

The paper has explored analogue of gravitational synchrotron massive particle and Penrose process in MOdified Gravity (MOG) known as Scalar-Tensor-Vector-Gravity (STVG). Investigation of the gravitational field around Kerr-MOG black hole showed that it has strong gravitational field with large horizon and can rotate faster than Kerr black hole due to the effect of STVG. We have studied influence of STVG in circular motion of massive particle around Kerr-MOG black hole and discussed the Innermost Stable Circular Orbit (ISCO) of massive test particle. It is shown that STVG plays a crucial role in energy extraction from a rotating black hole, with an energy efficiency of more than $100\%$ according to the Penrose process. Furthermore, we have explored the gravitational synchrotron radiation analogue produced by a massive particle orbiting around a Kerr-MOG black hole. It has been shown that the intensity of gravitational radiation from binary systems of stellar black holes (SBH) and supermassive black holes (SMBH).