# Timescale for trans-Planckian collisions in Kerr spacetime

@article{Patil2015TimescaleFT,
title={Timescale for trans-Planckian collisions in Kerr spacetime},
author={Mandar Patil and Pankaj S. Joshi and Ken-ichi Nakao and Masashi Kimura and Tomohiro Harada},
journal={arXiv: General Relativity and Quantum Cosmology},
year={2015}
}
We make a critical comparison between ultra-high energy particle collisions around an extremal Kerr black hole and that around an over-spinning Kerr singularity, mainly focusing on the issue of the timescale of collisions. We show that the time required for two massive particles with the proton mass or two massless particles of GeV energies to collide around the Kerr black hole with Planck energy is several orders of magnitude longer than the age of the Universe for astro-physically relevant… Expand
3 Citations
The collisional Penrose process
• J. Schnittman
• Physics, Medicine
• General relativity and gravitation
• 2018
A specific astrophysical application of the collisional Penrose process is highlighted: the potential to enhance annihilation of dark matter particles in the vicinity of a supermassive black hole. Expand
Particle Acceleration by Static Black Holes in a Model of f(R) Gravity
• Physics
• 2015
Particle collisions are considered within the context of $f(R)$ gravity described by $f(R)=R+2\alpha\sqrt{R}$, where $R$ stands for the Ricci scalar and $\alpha$ is a non-zero constant. The center ofExpand
Effect of the self-gravity of shells on a high energy collision in a rotating Bañados-Teitelboim-Zanelli spacetime
• Physics
• 2018
We consider a collision of two dust thin shells with a high center-of-mass (CM) energy including their self-gravity in a Ba\~nados-Teitelboim-Zanelli (BTZ) spacetime. The shells divide the BTZExpand

#### References

SHOWING 1-10 OF 52 REFERENCES
Particle collisions on near horizon extremal Kerr background
Recently, Banados, Silk and West analyzed a collision of two particles near the horizon of the extremal Kerr black hole and demonstrated that the energy in the center-of-mass frame can be arbitrarilyExpand
Collision of two general geodesic particles around a Kerr black hole
• Physics
• 2011
We obtain an explicit expression for the center-of-mass (CM) energy of two colliding general geodesic massive and massless particles at any spacetime point around a Kerr black hole. Applying this, weExpand
Numerical estimation of the escaping flux of massless particles created in collisions around a Kerr black hole
The geodesics of massless particles produced in collisions near a rotating black hole are solved numerically and a Monte Carlo integration of the momentum distribution of the massless particles isExpand
High energy particle collisions in superspinning Kerr geometry
• Physics
• 2011
We investigate here the particle acceleration and high energy collision in the Kerr geometry containing a naked singularity. We show that the center of mass energy of collision between two particles,Expand
Emergent Flux from Particle Collisions Near a Kerr Black Hole
• Physics
• 2011
The escape fraction at infinity is evaluated for massless particles produced in collisions of weakly interacting particles accreted into a density spike near the particle horizon of an extremal KerrExpand
Unbound geodesics from the ergosphere and potential observability of debris from ultrahigh energy particle collisions
• Physics
• 2014
Particle collisions in black hole ergoregions may result in extremely high center of mass energies that could probe new physics if escape to infinity were possible. Here we show that some geodesicsExpand
Particle accelerators inside spinning black holes.
On the basis of the Kerr metric as a model for a spinning black hole accreting test particles from rest at infinity, I show that the center-of-mass energy for a pair of colliding particles isExpand
Kerr naked singularities as particle accelerators
• Physics
• 2011
We investigate here the particle acceleration by Kerr naked singularities. We consider a collision between particles dropped in from infinity at rest, which follow geodesic motion in the equatorialExpand
Upper limits of particle emission from high-energy collision and reaction near a maximally rotating Kerr black hole
• Physics
• 2012
The center-of-mass energy of two particles colliding near the horizon of a maximally rotating black hole can be arbitrarily high if the angular momentum of either of the incident particles isExpand
Revised upper limit to energy extraction from a Kerr black hole.
We present a new upper limit on the energy that may be extracted from a Kerr black hole by means of particle collisions in the ergosphere (i.e., the "collisional Penrose process"). Earlier work onExpand