934 citations
- The University of TokyoJP492 papers
- Kyoto UniversityJP316 papers
- Centre National de la Recherche ScientifiqueFR275 papers
- Tokyo Institute of TechnologyJP265 papers
- Hiroshima UniversityJP240 papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR239 papers
- RIKEN Nishina CenterJP216 papers
- High Energy Accelerator Research OrganizationJP213 papers
- RIKENJP205 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR201 papers
- Columbia UniversityUS199 papers
- Eötvös Loránd UniversityHU198 papers
21 papers · 2 filters
Relativistic stars in a cubic Galileon Universe
Hiromu Ogawa, Tsutomu Kobayashi, Kazuya Koyama
We study relativistic stars in Hordenski theories that evade the gravitational wave constraints and exhibit the Vainshtein mechanism, focusing on a model based on the cubic Galileo…
Revisiting slow-roll dynamics and the tensor tilt in general single-field inflation
Yosuke Mishima, Tsutomu Kobayashi
We explore the possibility of a blue-tilted gravitational wave spectrum from potential-driven slow-roll inflation in the Horndeski theory. In Kamada et al. (2012), it was claimed t…
On the gauge dependence of gravitational waves generated at second order from scalar perturbations
Keitaro Tomikawa, Tsutomu Kobayashi
We revisit and clarify the gauge dependence of gravitational waves generated at second order from scalar perturbations. In a universe dominated by a perfect fluid with a constant e…
Escape probability of a photon emitted near the black hole horizon
Kota Ogasawara, Takahisa Igata, Tomohiro Harada +1
We investigate the escape of photons from the vicinity of the horizon to infinity in the Kerr-Newmann black hole spacetime. We assume that a light source is at rest in a locally no…
Primordial non-Gaussianities of scalar and tensor perturbations in general bounce cosmology: Evading the no-go theorem
Shingo Akama, Shin'ichi Hirano, Tsutomu Kobayashi
It has been pointed out that matter bounce cosmology driven by a k-essence field cannot satisfy simultaneously the observational bounds on the tensor-to-scalar ratio and non-Gaussi…
Dynamical Transition from a Naked Singularity to a Black Hole
Kenta Hioki, Tomohiro Harada
We show that a Reissner-Nordström (RN) black hole can be formed by dropping a charged thin dust shell onto a RN naked singularity. This is in contrast to the fact that a RN naked s…