Hayato Motohashi

Associate Professor

Kogakuin University

Japan

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About

Hayato Motohashi is an Associate Professor at Kogakuin University in Japan. His research areas include black hole physics, gravitational wave optics, and non-Gaussianity in cosmology, as evidenced by his recent publications. His work explores topics such as quasinormal modes of black holes, primordial black holes, and gravitational waves in various theoretical frameworks.

Articles (20)

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2025

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2025

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2025

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2025

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2024

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2024

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2024

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2024

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2023

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2023

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2023

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2023

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2023

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2022

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2022

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2022

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2022

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2022

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2021

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2020

Collaborators (4)

Yuichiro TADA

Designated Assistant Professor

Nagoya University

JAPAN

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Shuichiro Yokoyama

Assistant Professor

Nagoya University

JAPAN

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Kazufumi Takahashi

Yukawa Institute for Theoretical Physics, Kyoto University

JAPAN

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Masashi Kimura

Lecturer

JAPAN

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Hayato Motohashi

Research Interests

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Articles (20)

Resonance of black hole quasinormal modes in coupled systems

Resonant Excitation of Quasinormal Modes of Black Holes

Primordial black holes and induced gravitational waves from logarithmic non-Gaussianity

Constant roll and non-Gaussian tail in light of logarithmic duality

Iterative extraction of overtones from black hole ringdown

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

Spin wave optics for gravitational waves lensed by a Kerr black hole

Exact Solution for Rotating Black Holes in Parity-Violating Gravity

Consistency of matter coupling in modified gravity

Quasinormal modes of Schwarzschild black holes on the real axis

Physical effects of gravitational waves: pedagogical examples

Squeezed bispectrum and one-loop corrections in transient constant-roll inflation

Effective description of generalized disformal theories

Differentiation identities for hypergeometric functions

Spectroscopy of Kerr−AdS5 spacetime with the Heun function: Quasinormal modes, greybody factor, and evaporation

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

Evaporation of echoing black holes

Invertible disformal transformations with higher derivatives

Exact solution for wave scattering from black holes: Formulation

Quantum Ostrogradsky theorem

Collaborators (4)

Yuichiro TADA

Shuichiro Yokoyama

Kazufumi Takahashi

Masashi Kimura

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