Signatures from the observed jet power and the radiative efficiency for rotating black holes in loop quantum gravity

TL;DR

This study explores how loop quantum gravity parameters influence jet power and radiative efficiency in rotating black holes, constraining these parameters using observational data and revealing limitations of LQG in explaining certain black hole phenomena.

Contribution

It introduces the effects of the LQG parameter on black hole jet power and efficiency, providing observational constraints and highlighting differences from classical black hole models.

Findings

LQG parameter decreases efficiency for slow rotators, increases for fast rotators.

Jet power increases with black hole spin.

Constraints on spin and LQG parameters from observational data.

Abstract

We investigate the radiative efficiency and jet power in the spacetime of a rotating black hole within the framework of loop quantum gravity (LQG), which includes an additional LQG parameter. The results show that as the LQG parameter increases, the radiative efficiency decreases for slowly rotating black holes while it increases for rapidly rotating black holes. Furthermore, the jet power is found to increase for different black hole spins. With the observed data from the well-known sources A0620-00, H1743-322, XTE J1550-564, GRS1124-683, GRO J1655-40, and GRS1915+105, we make some constraints on the black hole spin parameter and the LQG parameter. The presence of the LQG parameter broadens the allowed range of the black hole spin parameter for sources A0620-00, H1743-322, XTE J1550-564 and GRO J1655-40. However, for the source GRS 1915+105, there is no overlap between the allowed parameter regions, which implies that the rotating LQG black hole cannot simultaneously account for the observed jet power and the radiative efficiency as in other black hole spacetimes.