High energy particle collisions under Cauchy horizon

TL;DR

This paper demonstrates that unbounded energy collisions can occur inside the inner horizon of a Reissner-Nordstrom black hole without fine-tuning, highlighting potential instability mechanisms of black hole horizons.

Contribution

It introduces a scenario where high-energy particle collisions happen inside the black hole's inner horizon without the need for parameter fine-tuning, unlike previous models.

Findings

Energy in the center of mass frame can grow unbounded.

No fine-tuning of particle parameters is required.

Potential link to black hole horizon instability.

Abstract

We consider particle collision inside the inner horizon of the Reissner-Nordstrom metric in the so-called R region. We show that there exist scenario in which the enrgy in the center of mass frame grows unbounded. In contrast to the standard scenarios of high energy collisions in black hole background in the R region, fine tuning of particle parameters is not require. The effect found in this work can be considered as a massive particle counterpart of wave processes that contribute to instability of the inner black hole horizon.