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Escape of superheavy and highly energetic particles produced by particle collisions near maximally charged black holes

- H. Nemoto, U. Miyamoto, T. Harada, T. Kokubu
- Physics
- 30 December 2012

For particle collision near rapidly rotating Kerr black holes, the center-of-mass energy can be arbitrarily high if the angular momentum of either of the colliding particles is fine-tuned. Recently,… Expand

Confined Penrose process with charged particles

- T. Kokubu, Shoulong Li, Puxun Wu, Hongwei Yu
- PhysicsPhysical Review D
- 31 August 2021

Abstract We show that kinematics of charged particles allows us to model the growth of particles’ energy by consecutive particle splits, once a spherical mirror as a perfectly reflective boundary is… Expand

Linear stability analysis of a rotating thin-shell wormhole

- N. Tsukamoto, T. Kokubu
- PhysicsPhysical Review D
- 4 July 2018

We cut and paste two Ba\~nados-Teitelboim-Zanelli (BTZ) spacetimes at a throat by the Darmois-Israel method to construct a rotating wormhole with a thin shell filled with a barotropic fluid. The thin… Expand

Effect of inhomogeneity on primordial black hole formation in the matter dominated era

- T. Kokubu, K. Kyutoku, K. Kohri, T. Harada
- PhysicsPhysical Review D
- 8 October 2018

We investigate the effect of inhomogeneity on primordial black hole formation in the matter dominated era. In the gravitational collapse of an inhomogeneous density distribution, a black hole forms… Expand

PARTICLE CREATION IN GRAVITATIONAL COLLAPSE TO A HORIZONLESS COMPACT OBJECT

In the previous paper [Harada, Cardoso, and Miyata, Phys.\ Rev.\ D {\bf 99} (2019), 044039], it is shown that a hollow transmissive shell collapsing to an ultracompact object of radius very close to… Expand

Negative tension branes as stable thin shell wormholes

We investigate negative tension branes as stable thin shell wormholes (TSWs) in Reissner–Nordström-(anti) de Sitter spacetimes in d dimensional Einstein gravity. Imposing Z2 symmetry, we construct… Expand

Does the Gauss–Bonnet term stabilize wormholes?

TLDR

Thin-Shell Wormholes in Einstein and Einstein–Gauss–Bonnet Theories of Gravity

We review recent works on the possibility for eternal existence of thin-shell wormholes on Einstein and Einstein-Gauss-Bonnet gravity. We introduce thin-shell wormholes that are categorized into a… Expand

High energy particle collisions in static, spherically symmetric black-hole-like wormholes

- N. Tsukamoto, T. Kokubu
- Physics, Computer SciencePhysical Review D
- 17 December 2019

TLDR

High energy collision without fine tuning: Acceleration and multiple collisions of shells in a bound system

- T. Kokubu
- Physics
- 30 July 2020

High energy collision of massive bodies is investigated without fine tuning. We study multiple collisions of two spherical concentric shells in a gravitationally bound system and calculate the center… Expand

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