329 citations
- National Astronomical Observatory of JapanJP109 papers
- The University of TokyoJP62 papers
- The Graduate University for Advanced Studies, SOKENDAIJP59 papers
- Japan Aerospace Exploration AgencyJP46 papers
- Institute of Space and Astronautical ScienceJP43 papers
- Kagoshima UniversityJP38 papers
- Korea Astronomy and Space Science InstituteKR34 papers
- Ibaraki UniversityJP30 papers
- Nagoya UniversityJP29 papers
- National Institute of Technology, Gifu CollegeJP29 papers
- Kyoto UniversityJP26 papers
- Institute of Astronomy and Astrophysics, Academia SinicaTW25 papers
54 papers · 1 filter
Electric and dilatonic fields of a charged massive particle at rest in the field of a charged dilaton black hole
Nahomi Kan, Kiyoshi Shiraishi
We study linear-perturbation equations for the two-body system of a charged dilaton black hole, of which dilaton coupling constant is , and a static particle with mass , elec…
Spinorial Wheeler-DeWitt wave functions inside black hole horizons
Nahomi Kan, Takuma Aoyama, Kiyoshi Shiraishi
We revisit the solutions of the Wheeler-DeWitt (WDW) equation inside the horizons of spherical black holes and planar topological black holes in arbitrary dimensions. For these sys…
Ostrogradsky mode in scalar-tensor theories with higher-order derivative couplings to matter
Atsushi Naruko, Ryo Saito, Norihiro Tanahashi +1
A metric transformation is a tool to find a new theory of gravity beyond general relativity. The gravity action is guaranteed to be free from a dangerous Ostrogradsky mode as long…
Antipodal Angular Correlations of Inflationary Stochastic Gravitational Wave Background
Zhen-Yuan Wu, Ryo Saito, Nobuyuki Sakai
The measurement of the inflationary stochastic gravitational-wave background (SGWB) is one of the main goals of future GW experiments. In direct GW experiments, an obstacle to achi…
Classical and quantum bicosmology with noncommutativity
Nahomi Kan, Takuma Aoyama, Kiyoshi Shiraishi
Recently, Falomir, Gamboa, Mendez, Gondolo and Maldonado proposed a bicosmology scenario [1-4] for solving some cosmological problems related to inflation, dark matter, and thermal…
Third quantization for scalar and spinor wave functions of the Universe in an extended minisuperspace
Nahomi Kan, Takuma Aoyama, Taiga Hasegawa +1
We consider the third quantization in quantum cosmology of a minisuperspace extended by the Eisenhart-Duval lift. We study the third quantization based on both Klein-Gordon type an…