A5038168613- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Seismology and Earthquake Studies
- Statistical and numerical algorithms
- Meteorological Phenomena and Simulations
- Geophysics and Sensor Technology
- Magnetic confinement fusion research
- Model Reduction and Neural Networks
- Electricity Theft Detection Techniques
- Target Tracking and Data Fusion in Sensor Networks
- Time Series Analysis and Forecasting
- Electrical Fault Detection and Protection
- Computational Physics and Python Applications
- Seismic Imaging and Inversion Techniques
- Machine Fault Diagnosis Techniques
- Coastal and Marine Dynamics
The University of Tokyo
2017-2024
Pennsylvania State University
2022-2024
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...
After their successful first observing run (September 12, 2015 - January 2016), the Advanced LIGO detectors were upgraded to increase sensitivity for second (November 30, 2016 August 26, 2017). The Virgo detector joined on 1, 2017. We discuss updates that happened during this period in GstLAL-based inspiral pipeline, which is used detect gravitational waves from coalescence of compact binaries both low latency and an offline configuration. These include deployment a zero-latency whitening...
In this work, we develop a Bayesian data analysis framework to study the SGWB from bosonic clouds using Advanced LIGO and Virgo, building on previous work by Brito et.al (2017). We further improve model adding BH population of binary merger remnants. To assess performance our pipeline, quantify range boson masses that can be constrained Virgo measurements at design sensitivity. Furthermore, explore capability distinguish an ultralight stochastic signal due distant compact coalescences (CBC)....
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...
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.
Gravitational waves searches for compact binary mergers with LIGO and Virgo are presently a two stage process. First, gravitational wave signal is identified. Then, an exhaustive search over possible parameters performed. It critical that the identification efficient in order to maximize number of sources Initial signals happens real-time which requires less than one second computational time must be used each data collected. In contrast, subsequent parameter estimation may require hundreds...
Ultralight bosons, which are predicted in a variety of beyond-Standard-Model scenarios as dark-matter candidates, can trigger the superradiant instability around spinning black holes. This gives rise to oscillating boson condensates then dissipate through emission nearly monochromatic gravitational waves. Such systems promising sources for current and future gravitational-wave detectors. In this work, we consider minimally-coupled, massive vector produce significantly stronger signal...
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...
We present a rapid parameter estimation framework for compact binary coalescence (CBC) signals observed by the LIGO-Virgo-KAGRA (LVK) detector network. The goal of our is to enable optimal source localization neutron star (BNS) in low latency as well improve overall scalability full CBC analyses. Our based on reduced order quadrature (ROQ) technique and resolves its shortcomings utilizing multiple ROQ bases single run. have also developed sets various waveform models, IMRPhenomD,...
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...
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...
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...
The collection of gravitational waves (GWs) that are either too weak or numerous to be individually resolved is commonly referred as the gravitational-wave background (GWB). A confident detection and model-driven characterization such a signal will provide invaluable information about evolution Universe population GW sources within it. We present new, user-friendly Python--based package for data analysis search an isotropic GWB in ground--based interferometer data. employ cross-correlation...
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...
We describe the methods used to construct aligned-spin template bank of gravitational waveforms by Gstreamer and Ligo Algorithm Library (GstLAL)-based pipeline analyze data from second observing run Advanced Laser Interferometer Gravitational Wave Observatory (LIGO) first Virgo. The expands upon parameter space covered during LIGO's run, including coverage for merging compact binary systems with total mass between $2\text{ }\text{ }{\mathrm{M}}_{\ensuremath{\bigodot}}$ $400\text{ ratios 1...
We perform an anisotropic search for the stochastic gravitational-wave (GW) background by decomposing sky into its spherical harmonics components. Previous analyses have used diffraction limit to define highest-order components in this search. investigate whether angular resolution of is indeed diffraction-limited testing our ability detect and localize simulated GW signals. show that while using low-order harmonic modes optimal initially detecting sources, detected sources can be better...
Extended sources of the stochastic gravitational backgrounds have been conventionally searched on spherical harmonics bases. The analysis during previous observing runs by ground-based gravitational-wave detectors, such as LIGO and Virgo, yielded constraints angular power spectrum ${C}_{\ensuremath{\ell}}$, yet it lacks capability estimating other parameters a spectral index. In this paper, we introduce an alternative Bayesian formalism to search for signals with particular distribution...
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...
Joint electromagnetic and gravitational-wave (GW) observation is a major goal of both the GW astronomy communities for coming decade. One way to accomplish this direct follow-up candidates. Prompt emission may fade quickly, therefore it desirable have detection happen as quickly possible. A leading source latency in whitening data. We examine performance zero-latency filter pipeline compact binary coalescence (CBC) signals. find that reproduces signal-to-noise ratio (SNR) sufficiently...
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...
Recent gravitational-wave transient catalogs have used ${p}_{\text{astro}}$, the probability that a candidate is astrophysical, to select interesting candidates for further analysis. Unlike false alarm rates, which exclusively capture statistics of instrumental noise triggers, ${p}_{\text{astro}}$ incorporates rate at triggers are generated by both astrophysical signals and in estimating astrophysical. Multiple search pipelines can independently calculate each employing specific data...