Emergent Flux from Particle Collisions Near a Kerr Black Hole

TL;DR

This paper investigates how particles produced near an extremal Kerr black hole can escape and produce observable signals, potentially revealing physics at energies beyond current terrestrial accelerators.

Contribution

It analyzes the escape fraction of particles from collisions near extremal Kerr black holes and compares it with Schwarzschild black holes, highlighting potential observational signatures.

Findings

Redshifted signatures can be produced near extremal Kerr black holes.

Escape fraction of particles depends on black hole spin and collision location.

Potential to probe ultra-high-energy physics through astrophysical observations.

Abstract

The escape fraction at infinity is evaluated for massless particles produced in collisions of weakly interacting particles accreted into a density spike near the particle horizon of an extremal Kerr black hole, for the case of equatorial orbits. We compare with the Schwarzschild case, and argue that in the case of extremal black holes, redshifted signatures can be produced that could potentially explore the physics of particle collisions at centre of mass energies that extend beyond those of any feasible terrestrial accelerator.