output
20182026
most citedObservation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station

84 citations

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

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Showing gr-qcShow all

7 papers · 1 filter

gr-qc2026

Strong deflection of massive particles via the geodesic deviation equation

Takahisa Igata, Yohsuke Takamori

We develop a formulation of the strong deflection limit for the scattering of particles following timelike geodesics in asymptotically flat, static, and spherically symmetric space…

gr-qc2023★ 8 cited

Black hole ringdown from physically sensible initial value problem in higher-order scalar-tensor theories

Keisuke Nakashi, Masashi Kimura, Hayato Motohashi +1

We study odd-parity perturbations about static and spherically symmetric black hole solutions with a linearly time-dependent scalar field in higher-order scalar-tensor theories. In…

gr-qc2022★ 11 cited

General formulae for the periapsis shift of a quasi-circular orbit in static spherically symmetric spacetimes and the active gravitational mass density

Tomohiro Harada, Takahisa Igata, Hiromi Saida +1

We study the periapsis shift of a quasi-circular orbit in general static spherically symmetric spacetimes. We derive two formulae in full order with respect to the gravitational fi…

gr-qc2022★ 12 cited

Black hole perturbations in higher-order scalar-tensor theories: initial value problem and dynamical stability

Keisuke Nakashi, Masashi Kimura, Hayato Motohashi +1

We propose a physically sensible formulation of initial value problem for black hole perturbations in higher-order scalar-tensor theories. As a first application, we study monopole…

gr-qc2022★ 11 cited

Periapsis shifts in dark matter distribution with a dense core

Takahisa Igata, Yohsuke Takamori

We consider the periapsis shifts in dark matter distribution with a dense core. We model the dark matter distribution as an isotropic gas sphere, the Emden polytropic sphere of ind…

gr-qc2022★ 20 cited

Periapsis shifts in dark matter distribution around a black hole

Takahisa Igata, Tomohiro Harada, Hiromi Saida +1

We consider the periapsis shifts of bound orbits of stars on static clouds around a black hole. The background spacetime is constructed from a Schwarzschild black hole surrounded b…

gr-qc2021

Testing the Non-circularity of the Spacetime around Sagittarius A* with Orbiting Pulsars

Yohsuke Takamori, Atsushi Naruko, Yusuke Sakurai +3

A disformal Kerr black hole solution is a rotating black hole solution in a modified gravity theory which breaks the circular condition of spacetime differently from the case of th…