A5102757157- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- High-pressure geophysics and materials
- Geophysics and Sensor Technology
- Seismic Waves and Analysis
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Radio Astronomy Observations and Technology
- Advanced Frequency and Time Standards
- Dark Matter and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Cold Atom Physics and Bose-Einstein Condensates
- Magnetic confinement fusion research
- Spacecraft and Cryogenic Technologies
- Human Mobility and Location-Based Analysis
- Statistical and numerical algorithms
- Soil Moisture and Remote Sensing
- earthquake and tectonic studies
- Blind Source Separation Techniques
- Neuroscience and Neural Engineering
- Digital Marketing and Social Media
The Graduate University for Advanced Studies, SOKENDAI
2020-2024
National Astronomical Observatory of Japan
2020-2024
High Energy Accelerator Research Organization
2022-2023
Osaka City University
2023
Washington University in St. Louis
2023
ABES Engineering College
2022
University College of Medical Sciences
1996
The third Gravitational-Wave Transient Catalog (GWTC-3) describes signals detected with Advanced LIGO and Virgo up to the end of their observing run. Updating previous GWTC-2.1, we present candidate gravitational waves from compact binary coalescences during second half run (O3b) between 1 November 2019, 15:00 UTC 27 March 2020, 17:00 UTC. There are 35 coalescence candidates identified by at least one our search algorithms a probability astrophysical origin $p_\mathrm{astro} > 0.5$. Of...
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>...
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...
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,...
The ever-increasing number of detections gravitational waves (GWs) from compact binaries by the Advanced LIGO and Virgo detectors allows us to perform ever-more sensitive tests general relativity (GR) in dynamical strong-field regime gravity. We a suite GR using binary signals observed during second half third observing run those detectors. restrict our analysis 15 confident that have false alarm rates $\leq 10^{-3}\, {\rm yr}^{-1}$. In addition consistent with black hole (BH) mergers, new...
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 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....
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...
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...
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...
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...
We report on an all-sky search for continuous gravitational waves in the frequency band 20-2000\,Hz and with a time derivative range of $[-1.0, +0.1]\times10^{-8}$\,Hz/s. Such signal could be produced by nearby, spinning slightly non-axisymmetric isolated neutron star our galaxy. This uses LIGO data from first six months Advanced LIGO's Virgo's third observational run, O3. No periodic wave signals are observed, 95\%\ confidence-level (CL) frequentist upper limits placed their strengths. The...
Intermediate-mass black holes (IMBHs) span the approximate mass range $100$--$10^5\,M_\odot$, between (BHs) formed by stellar collapse and supermassive BHs at centers of galaxies. Mergers IMBH binaries are most energetic gravitational-wave sources accessible terrestrial detector network. Searches first two observing runs Advanced LIGO Virgo did not yield any significant binary signals. In third run (O3), increased network sensitivity enabled detection GW190521, a signal consistent with...
We present results of three wide-band directed searches for continuous gravitational waves from 15 young supernova remnants in the first half third Advanced LIGO and Virgo observing run. use search pipelines with distinct signal models methods identifying noise artifacts. Without ephemerides these sources, are conducted over a frequency band spanning 10~Hz to 2~kHz. find no evidence radiation sources. set upper limits on intrinsic strain at 95\% confidence level sample sub-bands, estimate...
We present a targeted search for continuous gravitational waves (GWs) from 236 pulsars using data the third observing run of LIGO and Virgo (O3) combined with second (O2). Searches were emission $l=m=2$ mass quadrupole mode frequency at only twice pulsar rotation (single harmonic) $l=2, m=1,2$ modes both once (dual harmonic). No evidence GWs was found so we 95\% credible upper limits on strain amplitudes $h_0$ single harmonic along pulsars' moments $Q_{22}$ ellipticities $\varepsilon$. Of...
We present a directed search for continuous gravitational wave (CW) signals emitted by spinning neutron stars located in the inner parsecs of Galactic Center (GC). Compelling evidence presence numerous population has been reported literature, turning this region into very interesting place to look CWs. In search, data from full O3 LIGO-Virgo run detector frequency band $[10,2000]\text{ }\text{ }\mathrm{Hz}$ have used. No significant detection was found and 95% confidence level upper limits...
Results are presented of searches for continuous gravitational waves from 20 accreting millisecond X-ray pulsars with accurately measured spin frequencies and orbital parameters, using data the third observing run Advanced LIGO Virgo detectors. The search algorithm uses a hidden Markov model, where transition probabilities allow frequency to wander according an unbiased random walk, while $\mathcal{J}$-statistic maximum-likelihood matched filter tracks binary phase. Three narrow sub-bands...