A5059183611- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Sensor Technology
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Seismic Waves and Analysis
- Cosmology and Gravitation Theories
- High-pressure geophysics and materials
- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Radio Astronomy Observations and Technology
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Advanced Fiber Laser Technologies
- Advanced Measurement and Metrology Techniques
- Magnetic confinement fusion research
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Photonic Crystal and Fiber Optics
- Advanced Thermodynamic Systems and Engines
- Advanced MEMS and NEMS Technologies
- Engineering Applied Research
- Surface Roughness and Optical Measurements
National Astronomical Observatory of Japan
2015-2024
Osaka City University
2023
The University of Tokyo
1972-2020
The Graduate University for Advanced Studies, SOKENDAI
2015-2020
Bunkyo University
2008
Tokyo University of Science
2006-2008
Furukawa Electric (Japan)
2005-2006
Furukawa Electric (United Kingdom)
2005
Sumitomo Heavy Industries (Japan)
2005
Waseda University
2003
The objectives of the DECi-hertz Interferometer Gravitational Wave Observatory (DECIGO) are to open a new window observation for gravitational wave astronomy and obtain insight into significant areas science, such as verifying characterizing inflation, determining thermal history universe, dark energy, describing formation mechanism supermassive black holes in center galaxies, testing alternative theories gravity, seeking hole matter, understanding physics neutron stars searching planets...
We report the observation of gravitational waves from two compact binary coalescences in LIGO's and Virgo's third observing run with properties consistent neutron star-black hole (NSBH) binaries. The events are named GW200105_162426 GW200115_042309, abbreviated as GW200105 GW200115; first was observed by LIGO Livingston Virgo, second all three LIGO-Virgo detectors. source has component masses $8.9^{+1.2}_{-1.5}\,M_\odot$ $1.9^{+0.3}_{-0.2}\,M_\odot$, whereas GW200115...
We report on the population properties of compact binary mergers inferred from gravitational-wave observations these systems during first three LIGO-Virgo observing runs. The Gravitational-Wave Transient Catalog 3 (GWTC-3) contains signals consistent with classes mergers: black hole, neutron star, and star–black hole mergers. infer star merger rate to be between 10 <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>1700</a:mn><a:mtext> </a:mtext><a:mtext>...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational antenna. It aims at detecting various kinds of waves between 1 mHz and 100 Hz frequently enough to open a new window observation for astronomy. The pre-conceptual design DECIGO consists three drag-free satellites, 1000 km apart from each other, whose relative displacements are measured by Fabry–Perot Michelson interferometer. We plan launch in 2024 after long intense development...
Abstract KAGRA is a newly built gravitational-wave telescope, laser interferometer comprising arms with length of 3 km, located in Kamioka, Gifu, Japan. was constructed under the ground and it operated using cryogenic mirrors that help reducing seismic thermal noise. Both technologies are expected to provide directions for future telescopes. In 2019, finished all installations designed configuration, which we call baseline KAGRA. For this occasion, present an overview from various viewpoints...
We report results of a search for an isotropic gravitational-wave background (GWB) using data from Advanced LIGO's and Virgo's third observing run (O3) combined with upper limits the earlier O1 O2 runs. Unlike in previous runs advanced detector era, we include Virgo GWB. The are consistent uncorrelated noise, therefore place on strength find that dimensionless energy density $\Omega_{\rm GW}\leq 5.8\times 10^{-9}$ at 95% credible level flat (frequency-independent) GWB, prior which is uniform...
Abstract The Deci-hertz Interferometer Gravitational Wave Observatory (DECIGO) is a future Japanese space mission with frequency band of 0.1 Hz to 10 Hz. DECIGO aims at the detection primordial gravitational waves, which could have been produced during inflationary period right after birth Universe. There are many other scientific objectives DECIGO, including direct measurement acceleration expansion Universe, and reliable accurate predictions timing locations neutron star/black hole binary...
The global network of gravitational-wave observatories now includes five detectors, namely LIGO Hanford, Livingston, Virgo, KAGRA, and GEO 600. These detectors collected data during their third observing run, O3, composed three phases: O3a starting in April 2019 lasting six months, O3b November O3GK 2020 2 weeks. In this paper we describe these various other science products that can be freely accessed through the Gravitational Wave Open Science Center at https://gwosc.org. main dataset,...
We use 47 gravitational-wave sources from the Third LIGO-Virgo-KAGRA Gravitational-Wave Transient Catalog (GWTC-3) to estimate Hubble parameter $H(z)$, including its current value, constant $H_0$. Each (GW) signal provides luminosity distance source and we corresponding redshift using two methods: redshifted masses a galaxy catalog. Using binary black hole (BBH) masses, simultaneously infer mass distribution $H(z)$. The displays peak around $34\, {\rm M_\odot}$, followed by drop-off....
A search for gravitational-wave signals produced by cosmic strings in the Advanced LIGO and Virgo full O3 data set improve upon previous LIGO-Virgo constraints on G\ensuremath{\mu} one to two orders of magnitude, depending model which is tested.
We present results of an all-sky search for continuous gravitational waves which can be produced by spinning neutron stars with asymmetry around their rotation axis, using data from the third observing run Advanced LIGO and Virgo detectors. Four different analysis methods are used to in a gravitational-wave frequency band 10 2048 Hz first derivative $-10^{-8}$ $10^{-9}$ Hz/s. No statistically-significant periodic signal is observed any four searches. As result, upper limits on strain...
This paper describes the first all-sky search for long-duration, quasi-monochromatic gravitational-wave signals emitted by ultralight scalar boson clouds around spinning black holes using data from third observing run of Advanced LIGO. We analyze frequency range 20~Hz to 610~Hz, over a small derivative zero, and use multiple resolutions be robust towards possible signal wanderings. Outliers this are followed up two different methods, one more suitable nearly monochromatic signals, other...
Abstract We report the observation of a coalescing compact binary with component masses 2.5–4.5 M ⊙ and 1.2–2.0 (all measurements quoted at 90% credible level). The gravitational-wave signal GW230529_181500 was observed during fourth observing run LIGO–Virgo–KAGRA detector network on 2023 May 29 by LIGO Livingston observatory. primary source has mass less than 5 99% credibility. cannot definitively determine from data alone whether either is neutron star or black hole. However, given...
Abstract Gravitational lensing by massive objects along the line of sight to source causes distortions gravitational wave (GW) signals; such may reveal information about fundamental physics, cosmology, and astrophysics. In this work, we have extended search for signatures all binary black hole events from third observing run LIGO-Virgo network. We repeated signals strong (1) performing targeted searches subthreshold signals, (2) calculating degree overlap among intrinsic parameters sky...
We report the observation of a coalescing compact binary with component masses $2.5\text{-}4.5~M_\odot$ and $1.2\text{-}2.0~M_\odot$ (all measurements quoted at 90% credible level). The gravitational-wave signal GW230529_181500 was observed during fourth observing run LIGO-Virgo-KAGRA detector network on 2023 May 29 by LIGO Livingston Observatory. primary source has mass less than $5~M_\odot$ 99% credibility. cannot definitively determine from data alone whether either is neutron star or...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational antenna. DECIGO expected to open a new window of observation for astronomy especially between 0.1 Hz and 10 Hz, revealing various mysteries universe such as dark energy, formation mechanism supermassive black holes, inflation universe. The pre-conceptual design consists three drag-free spacecraft, whose relative displacements are measured by differential Fabry-Perot Michelson...
KAGRA is a newly built gravitational wave observatory, laser interferometer with 3 km arm length, located in Kamioka, Gifu, Japan. In this series of articles, we present an overview the baseline KAGRA, for which finished installing designed configuration 2019. This article describes method calibration (CAL) used reconstructing signals from detector outputs, as well characterization (DET). We also review physical environmental monitors (PEM) system and geophysics (GIF). Both are...
Pre-DECIGO (DECihertz laser Interferometer Gravitational wave Observatory) consists of three spacecraft arranged in an equilateral triangle with 100 km arm lengths orbiting 2000 above the surface earth. It is hoped that launch date will be late 2020s. has one clear target: binary black holes (BBHs) like GW150914 and GW151226. can detect ~30M⊙–30M⊙ BBH mergers up to redshift z~30. The cumulative event rate ~1.8×105 events yr−1 Pop III origin model BBHs GW150914, it saturates at z~10, while...
We report results from searches for anisotropic stochastic gravitational-wave backgrounds using data the first three observing runs of Advanced LIGO and Virgo detectors. For time, we include in our analysis run search with a new efficient pipeline called pystoch on folded over one sidereal day. use radiometry (broadband narrow band) to produce sky maps gravitational waves point sources. A spherical harmonic decomposition method is employed look emission spatially-extended Neither technique...
DECi-hertz Interferometer Gravitational-wave Observatory (DECIGO) is a future Japanese space gravitational-wave antenna. The most important objective of DECIGO, among various sciences to be aimed at, detect gravitational waves coming from the inflation universe. DECIGO consists four clusters spacecraft, and each cluster three spacecraft with Fabry–Perot Michelson interferometers. As pathfinder mission B-DECIGO will launched, hopefully in 2020s, demonstrate technologies necessary for as well...
We present a search for dark photon matter that could couple to gravitational-wave interferometers using data from Advanced LIGO and Virgo's third observing run. To perform this analysis, we use two methods, one based on cross-correlation of the strain channels in nearly aligned detectors, looks excess power Virgo detectors. The method optimizes Fourier Transform coherence time as function frequency, account expected signal width due Doppler modulations. do not find any evidence with mass...
Abstract Isolated neutron stars that are asymmetric with respect to their spin axis possible sources of detectable continuous gravitational waves. This paper presents a fully coherent search for such signals from eighteen pulsars in data LIGO and Virgo’s third observing run (O3). For known pulsars, efficient sensitive matched-filter searches can be carried out if one assumes the radiation is phase-locked electromagnetic emission. In presented here, we relax this assumption allow both...