Bremsstrahlung in the gravitational field of a global monopole

TL;DR

This paper studies the radiation emitted by a charged scalar particle moving uniformly in the spacetime of a global monopole, analyzing how the energy radiated depends on the particle's velocity and relativistic effects.

Contribution

It provides a detailed calculation of bremsstrahlung radiation in the global monopole spacetime, highlighting the dependence on velocity and Lorentz factor for small solid angle deficits.

Findings

Radiated energy scales with the cube of particle velocity in non-relativistic case.

Radiated energy scales with the cube of the Lorentz factor in ultra-relativistic case.

The spectrum and total energy radiated are explicitly calculated for the monopole spacetime.

Abstract

We investigate the radiation emitted by a uniformly moving charged scalar particle in the space-time of a point-like global monopole. We calculate the total energy radiated by the particle and the corresponding spectrum, for small solid angle deficit. We show that the radiated energy is proportional to the cube of the velocity of the particle and to the cube of the Lorenz factor, in the non-relativistic and ultra-relativistic cases, respectively.