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15 papers · 2 filters
Generalized 2D dilaton gravity and KGB
Kazufumi Takahashi, Tsutomu Kobayashi
We show explicitly that the nonminimal coupling between the scalar field and the Ricci scalar in 2D dilaton gravity can be recast in the form of kinetic gravity braiding (KGB). Thi…
Particle creation in gravitational collapse to a horizonless compact object
Tomohiro Harada, Vitor Cardoso, Daiki Miyata
Black holes (BHs) play a central role in physics. However, gathering observational evidence for their existence is a notoriously difficult task. Current strategies to quantify the…
On gravastar formation: What can be the evidence of a black hole?
Ken-ichi Nakao, Chul-Moon Yoo, Tomohiro Harada
Any observer outside black holes cannot detect any physical signal produced by the black holes themselves, since, by definition, the black holes are not located in the causal past…
General theory of cosmological perturbations in open and closed universes from the Horndeski action
Shingo Akama, Tsutomu Kobayashi
Our Universe is nearly spatially flat, but this does not mean that it is exactly spatially flat. In this paper we derive general quadratic actions for cosmological perturbations in…
Effect of the self-gravity of shells on a high energy collision in a rotating Bañados-Teitelboim-Zanelli spacetime
Kota Ogasawara, Naoki Tsukamoto
We consider a collision of two dust thin shells with a high center-of-mass (CM) energy including their self-gravity in a Bañados-Teitelboim-Zanelli (BTZ) spacetime. The shells divi…
Extended Cuscuton: Formulation
Aya Iyonaga, Kazufumi Takahashi, Tsutomu Kobayashi
Among single-field scalar-tensor theories, there is a special class called "cuscuton," which is represented as some limiting case of k-essence in general relativity. This theory ha…