200 citations · 377 across the 7 of their papers we have counts for
9 papers · 1 filter
Resonant speed meter for gravitational wave detection
Atsushi Nishizawa, Seiji Kawamura, Masa-aki Sakagami
Gravitational-wave detectors have been well developed and operated with high sensitivity. However, they still suffer from mirror displacement noise. In this paper, we propose a res…
Possible discovery of a nonlinear tail and second-order quasinormal modes in black hole ringdown
Satoshi Okuzumi, Kunihito Ioka, Masa-aki Sakagami
We investigate the nonlinear evolution of black hole ringdown in the framework of higher-order metric perturbation theory. By solving the initial-value problem of a simplified nonl…
Optimal Location of Two Laser-interferometric Detectors for Gravitational Wave Backgrounds at 100 MHz
Atsushi Nishizawa, Seiji Kawamura, Tomotada Akutsu +8
Recently, observational searches for gravitational wave background (GWB) have been developed and given constraints on the energy density of GWB in a broad range of frequencies. The…
Laser-interferometric Detectors for Gravitational Wave Background at 100 MHz : Detector Design and Sensitivity
Atsushi Nishizawa, Seiji Kawamura, Tomotada Akutsu +8
Recently, observational searches for gravitational wave background (GWB) have developed and given direct and indirect constraints on the energy density of GWB in a broad range of f…
Quantum Noise in Differential-type Gravitational-wave Interferometer and Signal Recycling
Atsushi Nishizawa, Seiji Kawamura, Masa-aki Sakagami
There exists the standard quantum limit (SQL), derived from Heisenberg's uncertainty relation, in the sensitivity of laser interferometer gravitational-wave detectors. However, in…
Quasinormal ringing of acoustic black holes in Laval nozzles: Numerical simulations
Satoshi Okuzumi, Masa-aki Sakagami
Quasinormal ringing of acoustic black holes in Laval nozzles is discussed. The equation for sounds in a transonic flow is written into a Schrödinger-type equation with a potential…