Kei-ichiro Kubota

Exact Cancellation of Horizon Modes in Kerr Ringdown

Kei-ichiro Kubota, Yusuke Manita, Hayato Motohashi, Daiki Watarai

Ringdown gravitational waves probe black hole spacetimes via quasinormal modes (QNMs). Recent studies have reported oscillatory features in QNM-filtered waveforms, and have led to conflicting interpretations as to whether they represent a near-horizon "direct wave". Reexamining a particle plunging into a Kerr …

Ringdown analysis of GW250114 with orthonormal modes

Anonymous, Kei-ichiro Kubota, S. Morisaki, Hayato Motohashi et autres

jp (code pays fourni par la source)

Exceptional points and resonance in black hole ringdown

Rodrigo Panosso Macedo, Takuya Katagiri, Kei-ichiro Kubota, Hayato Motohashi

We propose an exceptional-point (EP) framework for black-hole ringdown beyond the standard quasinormal-mode (QNM) paradigm. It provides a first-principles characterization of the resonance associated with avoided crossings near EPs, an effect that conventional QNM analysis cannot fully capture. Employing a phenomenological environmental …

it, jp (code pays fourni par la source)

Pole Skipping, Avoided Crossing, and Resonant Excitation in Kerr Quasinormal Modes near Algebraically Special Frequencies

Kei-ichiro Kubota, Hayato Motohash

Kerr quasinormal modes near algebraically special frequencies exhibit anomalous behavior, including apparent bifurcation, disappearance, and a nonsmooth connection to the Schwarzschild limit, which has remained puzzling for decades. Tracking poles and zeros of Green-function building blocks across different Riemann sheets, we show …

Pole Skipping, Avoided Crossing, and Resonant Excitation in Kerr Quasinormal Modes near Algebraically Special Frequencies

Kei-ichiro Kubota, Hayato Motohash

Kerr quasinormal modes near algebraically special frequencies exhibit anomalous behavior, including apparent bifurcation, disappearance, and a nonsmooth connection to the Schwarzschild limit, which has remained puzzling for decades. Tracking poles and zeros of Green-function building blocks across different Riemann sheets, we show …

jp (code pays fourni par la source)

Ringdown analysis of GW250114 with orthonormal modes

Motoki Suzuki, Kei-ichiro Kubota, S. Morisaki, Hayato Motohashi et autres

GW250114 is the loudest gravitational wave event to date observed by LIGO-Virgo-KAGRA Collaboration. Owing to its high signal-to-noise ratio (SNR), previous analyses based on quasinormal mode (QNM) superpositions have suggested evidence of the fundamental and the first overtone of the $\ell=m=2$ mode …

Ringdown analysis of GW250114 with orthonormal modes

Motoki Suzuki, Kei-ichiro Kubota, S. Morisaki, Hayato Motohashi et autres

GW250114 is the loudest gravitational wave event to date observed by LIGO-Virgo-KAGRA Collaboration. Owing to its high signal-to-noise ratio (SNR), previous analyses based on quasinormal mode (QNM) superpositions have suggested evidence of the fundamental and the first overtone of the $\ell=m=2$ mode …

jp (code pays fourni par la source)

Pole Skipping, Avoided Crossing, and Resonant Excitation of Kerr Quasinormal Modes near Algebraically Special Frequencies

Kei-ichiro Kubota, Hayato Motohashi

Description: This repository provides animations and code associated with the paper "Pole Skipping, Avoided Crossing, and Resonant Excitation in Kerr Quasinormal Modes near Algebraically Special Frequencies". Contents: Inverse_of_the_incidence_coefficient_of_the_Teukolsky_eq_on_Riemann_sheet.mp4 (Fig. 1): A visualization of the inverse of the incidence coefficient focusing on the …

jp (code pays fourni par la source)

Pole Skipping, Avoided Crossing, and Resonant Excitation of Kerr Quasinormal Modes near Algebraically Special Frequencies

Kei-ichiro Kubota, Hayato Motohashi

Description: This repository provides animations and code associated with the paper "Pole Skipping, Avoided Crossing, and Resonant Excitation in Kerr Quasinormal Modes near Algebraically Special Frequencies". Contents: Inverse_of_the_incidence_coefficient_of_the_Teukolsky_eq_on_Riemann_sheet.mp4 (Fig. 1): A visualization of the inverse of the incidence coefficient focusing on the …

jp (code pays fourni par la source)

Ringdown Analysis of GW250114 with Orthonormal Modes

Suzuki Motoki, Kei-ichiro Kubota, S. Morisaki, Hayato Motohashi et autres

jp (code pays fourni par la source)

Ringdown Analysis of GW250114 with Orthonormal Modes

Motoki Suzuki, Kei-ichiro Kubota, S. Morisaki, Hayato Motohashi et autres

jp (code pays fourni par la source)

Ringdown Analysis of GW250114 with Orthonormal Modes

Suzuki Motoki, Kei-ichiro Kubota, S. Morisaki, Hayato Motohashi et autres

jp (code pays fourni par la source)