A. D. Viets
A5020581295- 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
- High-pressure geophysics and materials
- Magnetic confinement fusion research
- Mechanical and Optical Resonators
- Radio Astronomy Observations and Technology
- Statistical and numerical algorithms
- Model Reduction and Neural Networks
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Superconducting Materials and Applications
- Seismology and Earthquake Studies
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Seismic Waves and Analysis
- Black Holes and Theoretical Physics
- Meteorological Phenomena and Simulations
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Electrical Measurement Techniques
- Inertial Sensor and Navigation
Concordia University Wisconsin
2018-2024
University of Wisconsin–Milwaukee
2017-2023
University of Florida
2023
University of Wisconsin System
2019-2021
Universität Hamburg
2021
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...
The raw outputs of the detectors within Advanced Laser Interferometer Gravitational-Wave Observatory need to be calibrated in order produce estimate dimensionless strain used for astrophysical analyses. two have been upgraded since second observing run and finished year-long third run. Understanding, accounting, and/or compensating complex-valued response each part improves overall accuracy estimated detector gravitational waves. We describe improved understanding methods quantify detector,...
Calibration of the Advanced LIGO detectors is quantification detectors' response to gravitational waves. Gravitational waves incident on cause phase shifts in interferometer laser light which are read out as intensity fluctuations at detector output. Understanding this crucial producing accurate and precise wave strain data. Estimates binary black hole neutron star parameters tests general relativity require well-calibrated data, miscalibrations will lead biased results. We describe method...
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.
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...
Advanced LIGO's raw detector output needs to be calibrated compute dimensionless strain h(t). Calibrated data is produced in the time domain using both a low-latency, online procedure and high-latency, offline procedure. The low-latency h(t) stream two stages, first of which performed on same computers that operate detector's feedback control system. This stage, referred as front-end calibration, uses infinite impulse response (IIR) filtering performs all operations at 16384 Hz digital...
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...
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 present the probability distribution of systematic errors in most accurate, high-latency version reconstructed dimensionless strain $h$, at Hanford and Livingston LIGO detectors, used for gravitational-wave astrophysical analysis, including parameter estimation, last five months third observing run (O3B). This work extends results presented Sun et. al (2020) [1] first six (O3A). The complex-valued, frequency-dependent, slowly time-varying error (excursion from unity magnitude zero phase)...
Gravitational-wave observations became commonplace in Advanced LIGO-Virgo's recently concluded third observing run. 56 non-retracted candidates were identified and publicly announced near real time. Gravitational waves from binary neutron star mergers, however, remain of special interest since they can be precursors to high-energy astrophysical phenomena like $γ$-ray bursts kilonovae. While late-time electromagnetic emissions provide important information about the processes within, prompt...
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...
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...
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...
Abstract The response of the Advanced Laser Interferometer Gravitational-wave Observatory (Advanced LIGO) interferometers is known to vary with time (Tuyenbayev et al 2017 Class. Quantum Grav. 34 015002). Accurate calibration must therefore track and compensate for temporal variations in model parameters. These were tracked during first three LIGO observing runs, compensation some them has been implemented procedure. During second run, multiplicative corrections interferometer applied while...
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...
We develop a robust and self-consistent framework to extract classify gravitational wave candidates from noisy data, for the purpose of assisting in real-time multi-messenger follow-ups during LIGO-Virgo-KAGRA's fourth observing run~(O4). Our formalism implements several improvements low latency calculation probability astrophysical origin~(\PASTRO{}), so as correctly account various factors such sensitivity change between runs, deviation recovered template waveform true signal that can...