89 citations · 774 across the 55 of their papers we have counts for
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Overtones and Nonlinearities in Binary Black Hole Ringdowns
Matthew Giesler, Sizheng Ma, Keefe Mitman +11
Using high-accuracy numerical relativity waveforms, we confirm the presence of numerous overtones of the , quasinormal mode early in the ringdown of binary black hole…
Remote Hawking-Moss instanton and the Lorentzian path integral
Daiki Saito, Naritaka Oshita
The Hawking-Moss (HM) bounce solution implies that the tunneling amplitude between vacua is uniquely determined by the vacuum energy at the initial vacuum and the top of a potentia…
Reconstruction of ringdown with excitation factors
Naritaka Oshita, Vitor Cardoso
In black hole perturbation formalism, the gravitational waveform is obtained by the convolution of the Green's function and the source term causing radiation emission. Hence, the r…
(In)stability of the black hole greybody factors and ringdowns against a small-bump correction
Naritaka Oshita, Kazufumi Takahashi, Shinji Mukohyama
Recently, it has been proposed that the black hole greybody factors can be important to model ringdown spectral amplitudes. We study the stability of greybody factors against a sma…
Scalar Quasi-Normal Modes of a Loop Quantum Black Hole
Etera R. Livine, Clara Montagnon, Naritaka Oshita +1
We compute the Quasi-Normal Mode (QNM) frequencies for scalar perturbations for modified Schwarzschild black holes in Loop Quantum Gravity. We study the singularity-free polymerize…
Tidal Love Numbers from EFT of Black Hole Perturbations with Timelike Scalar Profile
Chams Gharib Ali Barura, Hajime Kobayashi, Shinji Mukohyama +3
We study static tidal Love numbers (TLNs) of a static and spherically symmetric black hole for odd-parity metric perturbations. We describe black hole perturbations using the effec…
Black holes, multiple propagation speeds, and energy extraction
Vitor Cardoso, Shinji Mukohyama, Naritaka Oshita +1
The Standard Model of particle physics predicts the speed of light to be a universal speed of propagation of massless carriers. However, other possibilities exist -- including Lore…
Slowly decaying ringdown of a rapidly spinning black hole II: Inferring the masses and spins of supermassive black holes with LISA
Daiki Watarai, Naritaka Oshita, Daichi Tsuna
Electromagnetic observations reveal that almost all galaxies have supermassive black holes (SMBHs) at their centers, but their properties, especially their spins, are not fully und…
Greybody Factors Imprinted on Black Hole Ringdowns. II. Merging Binary Black Holes
Kazumasa Okabayashi, Naritaka Oshita
The spectral amplitude of the merger-ringdown gravitational wave (GW) emitted by a comparable mass-ratio black hole merger is modeled by the greybody factor of the remnant black ho…