Kerr-Sen black hole as accelerator for spinning particles

Abstract

It has been proved that arbitrarily high-energy collision between two particles can occur near the horizon of an extremal Kerr black hole as long as the energy E and angular momentum L of one particle satisfies a critical relation, which is called the BSW mechanism.Previous researchers mainly concentrate on geodesic motion of particles. In this paper, we will take spinning particle which won't move along a timelike geodesic into our consideration, hence, another parameter s describing the particle's spin angular momentum was introduced. By employing the Mathisson-Papapetrou-Dixon equation describing the movement of spinning particle, we will explore whether a Kerr-Sen black hole which is slightly different from Kerr black hole can be used to accelerate a spinning particle to arbitrarily high energy. We found that when one of the two colliding particles satisfies a critical relation between the energy E and the total angular momentum J, or has a critical spinning angular momentum s c , a divergence of the center-of-mass energy E cm will be obtained.

Pair production of scalars around near-extremal Kerr-Sen black holes

“…The particular interest of our present work is the charged and rotating black holes in the low energy of heterotic string theory [9], namely the Kerr-Sen black holes. Studies on this black hole keep appearing in the last couple of years [10][11][12][13][14][15][16][17][18][19] as a part of strong gravity researches beyond Einstein. In fact, Kerr-Sen black holes are characterized by exactly the same parameters which describe a Kerr-Newman black hole, i.e.…”

Collisional Penrose process of BTZ black holes

“…in [8] indicates that the maximal efficiency is about 13.92 for a massless and a massive particle collide near the horizon. Many effects have been done to generalize the collisonal Penrose process to various black holes background, see [9][10][11][12][13][14][15] and references therein for detail.…”

Universality of BSW mechanism for spinning particles

“…The a e-mail: jiejiang@mail.bnu.edu.cn b e-mail: sijie@bnu.edu.cn orbit of a spinning particle deviates from a geodesic and can be described by the Mathisson-Papapetrou-Dixon (MPD) equation [15][16][17][18]. The BSW mechanism for spinning particles in Kerr, Kerr-Newman and Kerr-Sen spacetimes has been investigated [19][20][21].…”