6 papers
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…
Higher-order statistics of the stochastic gravitational wave background from supermassive black hole binaries
Hinano Hisamatsu, Koutarou Kyutoku
Recent progress in gravitational wave observations has positioned Pulsar Timing Arrays as a key tool for detecting the stochastic gravitational wave background in the nanohertz ban…
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…
Signature of hadron-quark crossover in binary-neutron-star mergers
Yuki Fujimoto, Kenji Fukushima, Kenta Hotokezaka +1
We study observational signatures of the hadron-quark crossover in binary-neutron-star mergers by numerical-relativity simulations with various mass configurations. We employ two e…
Jet from binary neutron star merger with prompt black hole formation
Kota Hayashi, Kenta Kiuchi, Koutarou Kyutoku +2
We performed the longest numerical-relativity neutrino-radiation magnetohydrodynamics simulation for a binary neutron star merger that extends to after the…