Rigidly Rotating String Sticking in a Kerr Black Hole

TL;DR

This paper investigates the behavior of rigidly rotating strings in Kerr black hole spacetime, revealing conditions for horizon sticking, energy extraction, and maximum luminosity, consistent with black hole thermodynamics.

Contribution

It introduces conditions for strings sticking to the horizon and quantifies energy extraction and luminosity limits in Kerr black holes.

Findings

Sticking condition for strings at the horizon derived.

Energy can be extracted via the sticking string.

Maximum luminosity of energy extraction identified.

Abstract

We analyze rigidly rotating Nambu--Goto strings in the Kerr spacetime, particularly focusing on the strings sticking in the horizon. From the regularity on the horizon, we find the condition for sticking in the horizon, which is consistent with the second law of the black hole thermodynamics. Energy extraction through the sticking string from a Kerr black hole occurs. We obtain the maximum value of the luminosity of the energy extraction.