A5023161226- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Geophysics and Sensor Technology
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Astrophysics and Cosmic Phenomena
- Policing Practices and Perceptions
- Hong Kong and Taiwan Politics
- Radio Astronomy Observations and Technology
- Atomic and Subatomic Physics Research
- Cybercrime and Law Enforcement Studies
- Advanced Frequency and Time Standards
- Dark Matter and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Adaptive optics and wavefront sensing
- Sex work and related issues
- World Trade Organization Law
- Crime, Illicit Activities, and Governance
- Japanese History and Culture
- Financial Distress and Bankruptcy Prediction
- Imbalanced Data Classification Techniques
- Astronomical Observations and Instrumentation
Institute of Physics, Academia Sinica
2020-2024
King's College London
2022-2024
Universidad de Londres
2024
University of Wisconsin–Milwaukee
2024
University College London
2022-2023
University of London
2022-2023
National Taiwan Normal University
2014-2021
Chinese University of Hong Kong
2019-2020
The University of Tokyo
2020
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...
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...
Abstract KAGRA is a newly build gravitational wave observatory, laser interferometer with 3 km arm length, located in Kamioka, Gifu, Japan. In this paper, one of series articles featuring KAGRA, we discuss the science targets projects, considering not only baseline (current design) but also its future upgrade candidates (KAGRA+) for near to middle term ($\sim$5 years).
Multimessenger searches for binary neutron star (BNS) and star-black hole (NSBH) mergers are currently one of the most exciting areas astronomy. The search joint electromagnetic neutrino counterparts to gravitational wave (GW)s has resumed with ALIGO’s, AdVirgo’s KAGRA’s fourth observing run (O4). To support this effort, public semiautomated data products sent in near real-time include localization source properties guide complementary observations. In preparation O4, we have conducted a...
KAGRA is a second-generation interferometric gravitational-wave detector with 3-km arms constructed at Kamioka, Gifu in Japan. It now its final installation phase, which we call bKAGRA (baseline KAGRA), scientific observations expected to begin late 2019. One of the advantages underground location least 200 m below ground surface, brings small seismic motion low frequencies and high stability detector. Another advantage that it cools down sapphire test mass mirrors cryogenic temperatures...
Abstract KAGRA, the kilometer-scale underground gravitational-wave detector, is located at Kamioka, Japan. In April 2020, an astrophysics observation was performed KAGRA detector in combination with GEO 600 detector; this operation called O3GK. The optical configuration O3GK based on a power-recycled Fabry–Pérot–Michelson interferometer; all mirrors were set room temperature. duty factor of approximately 53%, and displacement sensitivity 1 × 10−18 ${\rm m}/\sqrt{\rm {Hz}}$ 250 Hz....
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. this occasion, present an overview from various viewpoints series...
We study the observation of polarized stochastic gravitational-wave background (SGWB) in pulsar-timing-array experiments. The time residual for an observed pulsar is formulated as a line-of-sight integral that incorporates effects term, from which we construct correlation function between pair pulsars terms overlap reduction functions (ORFs) SGWB intensity and polarization anisotropies. Our formulation provides numerical scheme computing ORFs high multipole moments, lowest-moment linear are...
Modern ground-based gravitational wave (GW) detectors require a complex interferometer configuration with multiple coupled optical cavities.Since achieving the resonances of arm cavities is most challenging among lock acquisition processes, scheme called length stabilization (ALS) had been employed for cavities.We designed new type ALS, which compatible interferometers having long arms like next generation GW detectors.The features ALS are that control simpler than those previous ones and it...
Even though the sensitivity of direct dark matter search experiments reaches level about 10−45cm2, no confident signal has been observed. We point out that, if is a vector boson, null result in may be due to destructive effects dark-matter–nucleon elastic scattering. illustrate scenario using modified Higgs portal model that includes exotic quarks. The significant cancellation can occur for certain mass gap between new heavy quark and matter. As result, spin-independent scattering so...
A vibration isolation system called the Type-Bp used for power recycling mirrors has been developed KAGRA, interferometric gravitational-wave observatory in Japan. suspension of passively isolates an optic from seismic using three main pendulum stages equipped with two vertical systems. compact reaction mass around each allows achieving sufficient damping performance a simple feedback as well ratio. Three systems were installed and proved to satisfy requirements on performance, also...
We apply the independent component analysis (ICA) to real data from a gravitational wave detector for first time. Specifically we use iKAGRA taken in April 2016, and calculate correlations between strain channel 35 physical environmental channels. Using couple of seismic channels which are found be strongly correlated with strain, perform ICA. Injecting sinusoidal continuous signal channel, find that ICA recovers correct parameters enhanced signal-to-noise ratio, demonstrates usefulness this...
KAGRA is a newly build gravitational-wave observatory, laser interferometer with 3 km arm length, located in Kamioka, Gifu, Japan. In this paper the series of KAGRA-featured articles, we discuss science targets projects, considering not only baseline (current design) but also its future upgrade candidates (KAGRA+) for near to middle term (~5 years).
We study the interferometric observation of intensity and polarization anisotropies a stochastic gravitational wave background. show that observed correlated data is defined in group manifold three-dimensional rotation. Explicit correlation between two detectors interferometry experiments such as LIGO-Virgo KAGRA constructed terms Wigner-$D$ functions. Our results may provide tool for constructing pipelines to estimate power spectra background anisotropies.
Abstract KAGRA is an underground interferometric gravitational wave detector which currently being commissioned. This relies on high-performance vibration-isolation systems to suspend its key optical components. These suspensions come in four different configurations, of the type-B used for beam splitter and signal recycling mirrors. The suspension comprises payload, three geometric anti-spring filters vertical isolation one inverted pendulum horizontal isolation. payload optic, marionette...
In April 2020, KAGRA conducted its first science observation in combination with the GEO~600 detector (O3GK) for two weeks. According to noise budget estimation, suspension control low frequency band and acoustic middle are identified as dominant contribution. this study, we show that such can be reduced offline data analysis by utilizing a method called Independent Component Analysis (ICA). Here ICA model is extended from one studied iKAGRA incorporating dependence while linearity...
Multi-messenger searches for BNS and NSBH mergers are currently one of the most exciting areas astronomy. The search joint electromagnetic neutrino counterparts to GWs has resumed with O4. To support this effort, public semi-automated data products sent in near real-time include localization source properties guide complementary observations. In preparation O4, we have conducted a study using simulated population compact binaries MDC form replay optimize profile software infrastructure...
Abstract KAGRA is a newly built gravitational wave observatory, laser interferometer with 3 km arm length, located in Kamioka, Gifu prefecture, Japan. In this article, we describe the data management system, i.e., recording of data, transfer from experiment site to computing resources, as well distribution tier sites, including international sites Taiwan and Korea. The amount exceeded 1.0 PiB increased by about 1.5 TB per day during operation 2020. Our system has succeeded management,...