Particles Collision near Kerr-Sen Dilaton-Axion Black Hole

TL;DR

This paper analyzes particle collisions near Kerr-Sen Dilaton-Axion black holes, exploring geodesic motion, effective potential, and collision energies, including particle-photon interactions, to understand high-energy processes near these black holes.

Contribution

It provides a detailed study of particle and photon collisions near Kerr-Sen black holes, including energy calculations at various horizons, extending understanding of high-energy phenomena in this spacetime.

Findings

Center of mass energy can become arbitrarily high near horizons.

Photon-particle collisions produce significant energy outputs.

Effective potential analysis reveals stable and unstable orbits.

Abstract

Here we consider static, axially symmetric, rotating and charged Kerr-Sen Dilaton-Axion black hole metric in generalized Boyer-Lindquist coordinates as particle accelerators. We obtain the geodesic motions of particle. We find the effective potential and discuss the circular orbit of a particle. We investigate the center of mass energy of two colliding neutral particles with different rest masses falling from rest at infinity to near the non-extremal horizons (event horizon and Cauchy horizon) and extremal horizon of the Kerr-Sen black hole. Analogous to the Compton process, we discuss the collision of a particle and a massless photon. Finally, we find the center of mass energy due to the collision of two photons in the background of Kerr-Sen black hole.