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8 papers · 2 filters
Negative tension branes as stable thin shell wormholes
Takafumi Kokubu, Tomohiro Harada
We investigate negative tension branes as stable thin shell wormholes in Reissner-Nordstrom-(anti) de Sitter spacetimes in dimensional Einstein gravity. Imposing Z2 symmetry, w…
Breaking of Vainshtein screening in scalar-tensor theories beyond Horndeski
Tsutomu Kobayashi, Yuki Watanabe, Daisuke Yamauchi
The Horndeski theory of gravity is known as the most general scalar-tensor theory with second-order field equations. Recently, it was demonstrated by Gleyzes et al. that the Hornde…
Black holes as particle accelerators: a brief review
Tomohiro Harada, Masashi Kimura
Rapidly rotating Kerr black holes can accelerate particles to arbitrarily high energy if the angular momentum of the particle is fine-tuned to some critical value. This phenomenon…
Covariant Stückelberg analysis of de Rham-Gabadadze-Tolley massive gravity with a general fiducial metric
Xian Gao, Tsutomu Kobayashi, Masahide Yamaguchi +1
The Stückelberg analysis of nonlinear massive gravity in the presence of a general fiducial metric is investigated. We develop a "covariant" formalism for the Stückelberg expansion…
How small can an over-spinning body be in general relativity?
Ken-ichi Nakao, Masashi Kimura, Tomohiro Harada +2
The angular momentum of the Kerr singularity should not be larger than a threshold value so that it is enclosed by an event horizon: The Kerr singularity with the angular momentum…
Exact black hole solutions in shift symmetric scalar-tensor theories
Tsutomu Kobayashi, Norihiro Tanahashi
We derive a variety of exact black hole solutions in a subclass of Horndeski's scalar-tensor theory possessing shift symmetry, , and reflection symmetry, . The the…