Kinematic censorship and high energy particle collisions in the Schwarzschild background

TL;DR

This paper investigates high-energy particle collisions near a Schwarzschild black hole horizon, examining conditions for infinite energy growth and confirming the principle of kinematic censorship that prevents infinite energy release.

Contribution

It analyzes the kinematic conditions under which unbounded energy can occur in particle collisions near a black hole horizon, reaffirming the principle of kinematic censorship.

Findings

Infinite energy growth is prevented by kinematic censorship.

Particle decay near the singularity can release unbounded energy.

White hole particle emissions influence collision energies.

Abstract

We consider near-horizon collisions between two particles moving freely in the Schwarzschild metric in the region outside the horizon. One of them emerges from a white hole. We scrutiny when such a process can lead to the indefinitely large growth of the energy in the center of mass frame in the point of collision. We also trace how the kinematics of collision manifests itself in preserving the principle of kinematic censorship according to which the energy released in any event of collision cannot be literally infinite. According to this principle, the energy released in any event of collision, must remain finite although it can be made as large as one likes. Also, we find that particle decay near the singularity leads to unbounded release of energy independently of its initial value.