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Escape of superheavy and highly energetic particles produced by particle collisions near maximally charged black holes
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,…
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Confined Penrose process with charged particles
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…
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Linear stability analysis of a rotating thin-shell wormhole
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…
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Effect of inhomogeneity on primordial black hole formation in the matter dominated era
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…
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PARTICLE CREATION IN GRAVITATIONAL COLLAPSE TO A HORIZONLESS COMPACT OBJECT
  • T. Kokubu, T. Harada
  • Physics
    Particle Physics at the Year of 150th Anniversary…
  • 13 November 2018
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…
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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…
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Does the Gauss–Bonnet term stabilize wormholes?
TLDR
It is shown that the Gauss–Bonnet term shrinks the parameter region that admits static wormholes, and it can destabilize hyperbolically symmetric wormholes as a non-perturbative effect, but spherically symmetry wormholes cannot be stable.
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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…
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High energy particle collisions in static, spherically symmetric black-hole-like wormholes
TLDR
It is shown that the center-of-mass energy for the head-on collision of the particles is large if the difference between the metrics of the wormhole and the black hole is small.
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High energy collision without fine tuning: Acceleration and multiple collisions of shells in a bound system
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…
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