A5102863808- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Seismic Waves and Analysis
- Statistical and numerical algorithms
- Radio Astronomy Observations and Technology
- Geophysics and Sensor Technology
- Astronomical Observations and Instrumentation
- Particle Detector Development and Performance
- High-pressure geophysics and materials
- Seismology and Earthquake Studies
- Quantum Chromodynamics and Particle Interactions
- Model Reduction and Neural Networks
- High-Energy Particle Collisions Research
- Meteorological Phenomena and Simulations
- Electrical Fault Detection and Protection
- Machine Fault Diagnosis Techniques
- Adaptive optics and wavefront sensing
The University of Tokyo
2012-2024
University of Wisconsin–Milwaukee
2017-2019
Austrian Academy of Sciences
2012
Institute for Cosmic Ray Research
2012
Colorado State University
2011
National Taiwan University
2007-2010
Institute of High Energy Physics
2010
Nagoya University
1971-1972
We report an indication that the elastic scattering rate of solar $^8$B neutrinos with electrons in Super-Kamiokande detector is larger when pass through Earth during nighttime. determine day/night asymmetry, defined as difference average day and night divided by those two rates, to be $(-3.2\pm1.1(\text{stat})\pm0.5(\text{syst}))\%$, which deviates from zero 2.7 $\sigma$. Since process mostly sensitive electron-flavored neutrinos, a non-zero asymmetry implies flavor oscillations are...
The GstLAL library, derived from Gstreamer and the LIGO Algorithm Library, supports a stream-based approach to gravitational-wave data processing. Although was primarily designed search for signatures of merging black holes neutron stars, it has also contributed other searches, calibration, detector-characterization efforts. played an integral role in all LIGO-Virgo collaboration detections, its low-latency configuration enabled rapid electromagnetic follow-up dozens compact binary candidates.
Abstract Binary neutron stars (BNSs) will spend ≃10–15 minutes in the band of Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo detectors at design sensitivity. Matched-filtering gravitational-wave (GW) data could principle accumulate enough signal-to-noise ratio (S/N) to identify a forthcoming event tens seconds before companions collide merge. Here we report on testing an early-warning GW detection pipeline. Early-warning alerts can be produced for sources that...
Starting from May 2023, the LIGO Scientific, Virgo and KAGRA Collaboration has been conducting fourth observing run with improved detector sensitivities an expanded network including KAGRA. Accordingly, it is vital to optimize detection algorithm of low-latency search pipelines, increasing their gravitational waves compact binary coalescences. In this work, we discuss several new features developed for ranking statistics GstLAL-based inspiral pipeline, which mainly consist signal...
GstLAL is a stream-based matched-filtering search pipeline aiming at the prompt discovery of gravitational waves from compact binary coalescences such as mergers black holes and neutron stars. Over past three observation runs by LIGO, Virgo, KAGRA Collaboration, has participated in several tens wave discoveries. The fourth observing run (O4) set to begin May 2023 expected see many new interesting signals which will inform our understanding astrophysics cosmology. We describe current...
Matched-filtering gravitational-wave search pipelines identify signals by computing correlations, i.e., signal-to-noise ratios, between detector data and template waveforms. Intrinsic parameters, the component masses spins, of waveforms are often stored in "template banks," construction a densely populated bank is essential for some pipelines. This paper presents that currently being used GstLAL-based compact binary pipeline fourth observing run LIGO, Virgo, KAGRA collaboration, was...
Precession in binary black holes (BBH) is caused by the failure of hole spins to be aligned and its study can open up new perspectives gravitational wave astronomy, providing, among other advancements, a precise measure distance an accurate characterization BBH spins. However, detecting precessing signals highly nontrivial task, as standard matched filtering pipelines for searches are built on many assumptions that do not hold case. This work details upgrades made GstLAL pipeline facilitate...
Used for both proton decay searches and neutrino physics, large water Cherenkov (WC) detectors have been very successful tools in particle physics. They are notable their masses charged detection capabilities. While current WC reconstruct tracks over a wide energy range, they cannot efficiently detect neutrons. Gadolinium (Gd) has the largest thermal neutron capture cross section of all stable nuclei produces an 8 MeV gamma cascade that can be detected with high efficiency. Because many new...
We demonstrate a new geometric method for fast template placement searches gravitational waves from the inspiral, merger and ringdown of compact binaries. The is based on binary tree decomposition bank parameter space into nonoverlapping hypercubes. use numerical approximation signal overlap metric at center each hypercube to estimate number templates required cover determine whether further split hypercube. As long as expected in given cube greater than threshold, we along its longest edge...
Leveraging the features of GstLAL pipeline, we present results a matched filtering search for asymmetric binary black hole systems with heavily misaligned spins in LIGO and Virgo data taken during third observing run. Our target show strong imprints precession whereas current searches have nonoptimal sensitivity detecting them. After measuring improvement brought by our over standard spin-aligned searches, report detection 30 gravitational wave events already discovered latest version...
The trilepton nucleon decay modes p→e+νν and p→μ+νν violate |Δ(B-L)| by two units. Using data from a 273.4 kt yr exposure of Super-Kamiokande search for these decays yields fit consistent with no signal. Accordingly, lower limits on the partial lifetimes τp→e+νν>1.7×10(32) years τp→μ+νν>2.2×10(32) at 90% confidence level are obtained. These can constrain Grand Unified Theories which allow such processes.
We present updates to GstLAL, a matched filter gravitational-wave search pipeline, in Advanced LIGO and Virgo's third observing run. discuss the incorporation of statistical data quality information into GstLAL's multi-dimensional likelihood ratio ranking statistic additional improvements for gravitational wave candidates found only one detector. Statistical is provided by iDQ, pipeline that infers presence short-duration transient noise using interferometer's auxiliary state, which has...
GstLAL is a stream-based matched-filtering search pipeline aiming at the prompt discovery of gravitational waves from compact binary coalescences such as mergers black holes and neutron stars. Over past three observation runs by LIGO, Virgo, KAGRA (LVK) collaboration, has participated in several tens wave discoveries. The fourth observing run (O4) set to begin May 2023 expected see many new interesting signals which will inform our understanding astrophysics cosmology. We describe current...
Starting from May 2023, the LIGO Scientific, Virgo and KAGRA Collaboration is planning to conduct fourth observing run with improved detector sensitivities an expanded network including KAGRA. Accordingly, it vital optimize detection algorithm of low-latency search pipelines, increasing their gravitational waves compact binary coalescences. In this work, we discuss several new features developed for ranking statistics GstLAL-based inspiral pipeline, which mainly consist of: signal...
Precession in Binary Black Holes (BBH) is caused by the failure of Hole spins to be aligned and its study can open up new perspectives gravitational waves (GW) astronomy, providing, among other advancements, a precise measure distance an accurate characterization BBH spins. However, detecting precessing signals highly non-trivial task, as standard matched filtering pipelines for GW searches are built on many assumptions that do not hold case. This work details upgrades made GstLAL pipeline...
Leveraging the features of GstLAL pipeline, we present results a matched filtering search for asymmetric binary black hole systems with heavily mis-aligned spins in LIGO and Virgo data taken during third observing run. Our target show strong imprints precession current searches have non-optimal sensitivity detecting them. After measuring improvement brought by our over standard spin-aligned searches, report detection 30 gravitational wave events already discovered latest Gravitational Wave...
Matched-filtering searches for gravitational-wave signals from compact binary mergers employ template banks which are a collection of modeled waveforms described by unique intrinsic parameters. We present two designed low-latency and archive sub-solar mass (SSM) in data the fourth observing run LIGO-Virgo-KAGRA, demonstrate efficacy via simulated signals. Further, we introduce set modifications to geometric, manifold algorithm that allow method work exceedingly low component masses necessary...
Matched-filtering gravitational wave search pipelines identify signals by computing correlations, i.e., signal-to-noise ratios, between detector data and template waveforms. Intrinsic parameters, the component masses spins, of waveforms are often stored in "template banks", construction a densely populated bank is essential for some pipelines. This paper presents that currently being used GstLAL-based compact binary pipeline fourth observing run LIGO, Virgo, KAGRA collaboration, was...
The GstLAL library, derived from Gstreamer and the LIGO Algorithm Library, supports a stream-based approach to gravitational-wave data processing. Although was primarily designed search for signatures of merging black holes neutron stars, it has also contributed other searches, calibration, detector-characterization efforts. played an integral role in all LIGO-Virgo collaboration detections, its low-latency configuration enabled rapid electromagnetic follow-up dozens compact binary candidates.
We present a novel gravitational-wave detection algorithm that conducts matched-filter search stochastically across the compact binary parameter space rather than relying on fixed bank of template waveforms. This technique is competitive with standard template-bank-driven pipelines in both computational cost and sensitivity. However, complexity analysis simpler, allowing for easy configuration horizontal scaling heterogeneous grids computers. To demonstrate method we analyze approximately...