Rapidly rotating spacetimes and collisional super-Penrose process

TL;DR

This paper demonstrates that in rapidly rotating axially symmetric spacetimes, particle collisions can produce arbitrarily high energy particles escaping to infinity, surpassing the energy of the colliding particles themselves, unlike black hole scenarios.

Contribution

It generalizes the super-Penrose process to generic rotating spacetimes, showing that high-energy escape is possible beyond specific models like black holes.

Findings

Energy of escaping particles can be arbitrarily large.

Super-Penrose process occurs in generic rotating spacetimes.

Escaping particle energy exceeds center-of-mass energy of collisions.

Abstract

We consider generic axially symmetric rotating spacetimes and examine particle collisions in the ergoregion. The results are generic and agree with those obtained in the particular case of the rotating Teo wormhole in N. Tsukamoto and C. Bambi, Phys. Rev. D 91, 104040 (2015). It is shown that for sufficiently rapid rotation, the energy of a particle escaping to infinity can become arbitrary large (so-called super-Penrose process). Moreover, this energy is typically much larger than the center-of mass energy of colliding particles. In this sense the situation differs radically from that for collisions near black holes.