624 citations · 9k across the 85 of their papers we have counts for
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Limiting cases of second-order moments of relativistic stars and their universality
Koutarou Kyutoku
Extending the work presented in a workshop ``From Quarks to Neutron Stars: Insights from kHz gravitational waves'', we discuss some limiting cases of the moment of inertia, tidal d…
Finite signal-to-noise ratio bias in parameter estimation for damped oscillations: cautionary remark about catalog-level black-hole spectroscopy
Koutarou Kyutoku
We investigate biases in parameter estimation for damped oscillations motivated by applications to black-hole spectroscopy in gravitational-wave physics. Focusing on the simplest m…
Assessment of universal relations among second-order moments of relativistic stars via reformulated perturbation equations
Koutarou Kyutoku
We assess the universal relations among second-order moments of relativistic stars, namely the moment of inertia, tidal deformability, and spin-induced quadrupole moment, via refor…
Quasinormal modes of Schwarzschild black holes on the real axis
Koutarou Kyutoku, Hayato Motohashi, Takahiro Tanaka
We study the scattering of gravitational waves by a Schwarzschild black hole and its perturbed siblings to investigate influences of proposed spectral instability of quasinormal mo…
Reducing orbital eccentricity in initial data of black hole--neutron star binaries in the puncture framework
Koutarou Kyutoku, Kyohei Kawaguchi, Kenta Kiuchi +2
We develop a method to compute low-eccentricity initial data of black hole--neutron star binaries in the puncture framework extending previous work on other types of compact binari…
Reanalysis of the binary neutron star mergers GW170817 and GW190425 using numerical-relativity calibrated waveform models
Tatsuya Narikawa, Nami Uchikata, Kyohei Kawaguchi +4
We reanalyze gravitational waves from binary-neutron-star mergers GW170817 and GW190425 using a numerical-relativity (NR) calibrated waveform model, the TF2+_Kyoto model, which inc…