A5103096169- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Geophysics and Sensor Technology
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- High-pressure geophysics and materials
- Seismic Waves and Analysis
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Statistical and numerical algorithms
- Astronomical Observations and Instrumentation
- Computational Physics and Python Applications
- Seismic Imaging and Inversion Techniques
- Superconducting Materials and Applications
- Seismology and Earthquake Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Black Holes and Theoretical Physics
- Magnetic confinement fusion research
- Adaptive optics and wavefront sensing
- GNSS positioning and interference
- Advanced Measurement and Metrology Techniques
- Astronomy and Astrophysical Research
University of Portsmouth
2019-2025
American University
2015-2024
Max Planck Institute for Gravitational Physics
2015-2021
Kavli Institute for Particle Astrophysics and Cosmology
2013-2020
University of California, Santa Barbara
2013-2020
Max Planck Society
2008-2017
Cardiff University
2008-2016
Syracuse University
2002-2016
Massachusetts Institute of Technology
2003-2012
Carleton College
2011
We describe the PyCBC search for gravitational waves from compact-object binary coalescences in advanced gravitational-wave detector data. The was used first Advanced LIGO observing run and unambiguously identified two black hole mergers, GW150914 GW151226. At its core, performs a matched-filter merger signals using bank of template waveforms. provide complete description pipeline including steps to mitigate effects noise transients data, identify candidate events measure their statistical...
We improve the accuracy of effective-one-body (EOB) waveforms that were employed during first observing run Advanced LIGO for binaries spinning, nonprecessing black holes by calibrating them to a set 141 numerical-relativity (NR) waveforms. The NR simulations expand domain calibration toward larger mass ratios and spins, as compared previous EOBNR model. Merger-ringdown computed in black-hole perturbation theory Kerr spins close extremal provide additional inputs calibration. For...
The Laser Interferometer Gravitational Wave Observatory (LIGO) consists of two widely separated 4 km laser interferometers designed to detect gravitational waves from distant astrophysical sources in the frequency range 10 Hz kHz. first observation run Advanced LIGO detectors started September 2015 and ended January 2016. A strain sensitivity better than $10^{-23}/\sqrt{\text{Hz}}$ was achieved around 100 Hz. Understanding both fundamental technical noise critical for increasing observable...
We study the effect of spins on searches for gravitational waves from compact binary coalescences in realistic simulated early advanced LIGO data. construct a detection pipeline including matched filtering, signal-based vetoes, coincidence test between different detectors, and an estimate rate background events. restrict attention to neutron star--black hole (NS-BH) systems, we compare search using non-spinning templates one that include aligned with orbital angular momentum. To run...
We describe the implementation of a search for gravitational waves from compact binary coalescences in LIGO and Virgo data. This all-sky, all-time, multi-detector coalescence has been used to data taken recent runs. The is built around matched filter analysis data, augmented by numerous signal consistency tests designed distinguish artifacts non-Gaussian detector noise potential detections. demonstrate performance using Gaussian fifth science run that are capable mitigating effect providing...
This paper presents an algorithm for constructing matched-filter template banks in arbitrary parameter space. The method places templates at random, then removes those which are ``too close'' together. properties and optimality of stochastic generated this manner investigated some simple models. effectiveness these gravitational wave searches binary inspiral waveforms is also examined. a bank compared to the deterministically placed that currently used data analysis.
The detection of gravitational waves from binary neutron stars is a major goal the gravitational-wave observatories Advanced LIGO and Virgo. Previous searches for with Virgo neglected component stars' angular momentum (spin). We demonstrate that neglecting spin in matched-filter causes advanced detectors to lose more than 3% possible signal-to-noise ratio 59% (6%) sources, assuming star dimensionless spins, $c\mathbf{J}/G{M}^{2}$, are uniformly distributed magnitudes between 0 0.4 (0.05)...
Current searches for gravitational waves from compact-object binaries with the LIGO and Virgo observatories employ waveform models spins aligned (or antialigned) orbital angular momentum. Here, we derive a new statistic to search compact objects carrying generic (precessing) spins. Applying this statistic, construct banks of both aligned- generic-spin templates binary black holes neutron star--black hole binaries, compare effectualness these towards simulated populations systems. We then use...
In the last few years, machine learning techniques, in particular convolutional neural networks, have been investigated as a method to replace or complement traditional matched filtering techniques that are used detect gravitational-wave signature of merging black holes. However, date, these methods not yet successfully applied analysis long stretches data recorded by Advanced LIGO and Virgo observatories. this work, we critically examine use networks tool search for We identify strengths...
Gravitational-wave observations of compact binaries have the potential to uncover distribution masses and angular momenta black holes neutron stars in universe. The binary components' physical parameters can be inferred from their effect on phasing gravitational-wave signal, but a partial degeneracy between mass ratio limits our ability measure individual component masses. At typical signal amplitudes expected by Advanced Laser Interferometer Observatory (signal-to-noise ratios 10 20), we...
Abstract We present the second Open Gravitational-wave Catalog (2-OGC) of compact-binary coalescences, obtained from complete set public data Advanced LIGO’s first and observing runs. For time we also search Virgo observatory. The sensitivity our benefits updated methods ranking candidate events including effects nonstationary detector noise varying network sensitivity; in a separate targeted binary black hole merger impose prior distribution component masses. identify population 14 with...
The detection of gravitational waves remains one the most challenging prospects faced by experimental physicists. One significant limits to sensitivity current, and future, long-baseline interferometric wave detectors is thermal displacement noise test masses their suspensions. Suspension will be an important source at operating frequencies between approximately 10 30 Hz, it results from a combination thermoelastic damping, surface loss bulk associated with suspension fibres, weld...
We present a detailed investigation into the properties of GW170729, gravitational wave with most massive and distant source confirmed to date. employ an extensive set waveform models, including new improved models that incorporate effect higher-order modes which are particularly important for systems. find no indication spin-precession, but inclusion in results estimate mass ratio $(0.3-0.8)$ at 90\% credible level. Our updated measurement excludes equal masses also lead data being more...
The Advanced LIGO detectors have recently completed their second observation run successfully. lasted for approximately 10 months and lead to multiple new discoveries. sensitivity gravitational waves was partially limited by correlated noise. Here, we utilize auxiliary sensors that witness these noise sources, use them subtraction in the time domain data. This line removal is particularly significant Hanford Observatory, where improvement greater than 20%. Consequently, were also able...
The worldwide advanced gravitational-wave (GW) detector network has so far primarily consisted of the two Advanced LIGO observatories at Hanford and Livingston, with Virgo joining 2016-7 O2 observation run a relatively late stage. However been observing alongside detectors since start O3 run; in near future, KAGRA will join global further India is under construction. Gravitational-wave search methods would therefore benefit from ability to analyse data an arbitrary detectors. In this paper,...
Abstract The third observing run of Advanced LIGO and Virgo took place between 2019 April 2020 March resulted in dozens gravitational-wave candidates, many which are now published as confident detections. A crucial requirement the was rapid identification public reporting compact binary mergers, enabled massive follow-up observation campaigns with electromagnetic neutrino observatories. PyCBC Live is a low-latency search for mergers based on frequency-domain matched filtering, used during...
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...
We present the details of a method for conducting targeted, coherent search compact binary coalescences. The is tailored to be used as followup electromagnetic transients such Gamma Ray Bursts. derive statistic Gaussian detector noise and discuss benefits coherent, multi-detector over coincidence methods. To mitigate effects non-stationary data, we introduce number signal consistency tests, including null SNR, amplitude several $\chi^{2}$ tests. demonstrate performance on data from LIGO's...
The first direct detection of neutron-star-black-hole binaries will likely be made with gravitational-wave observatories. Advanced LIGO and Virgo able to observe mergers at a maximum distance 900Mpc. To acheive this sensitivity, searches rely on using bank filter waveforms that accurately model the expected signal. angular momentum black hole is comparable orbital momentum. This affect dynamics inspiralling system alter phase evolution emitted In addition, if hole's not aligned it cause...
Current searches for the gravitational-wave signature of compact binary mergers rely on matched-filtering data from interferometric observatories with sets modeled gravitational waveforms. These currently use model waveforms that do not include higher-order mode content signal. Higher-order modes are important many and their omission reduces sensitivity to such sources. In this work we explore loss incurred omitting modes. We present a new method searching using effects, evaluate increase...
LIGO and Virgo recently observed the first binary neutron star merger, demonstrating that gravitational-waves offer ability to probe how matter behaves in one of most extreme environments Universe. However, gravitational-wave signal emitted by an inspiraling system is only weakly dependent on equation state extracting this information challenging. Previous studies have focused mainly systems where stars are spinning slowly main imprint inspiral due tidal effects. For binaries with...
Searching for gravitational waves (GWs) from binary black holes (BBHs) with LIGO and Virgo involves matched-filtering data against a set of representative signal waveforms --- template bank chosen to cover the full space interest as few possible. Although component may have significant angular momenta (spin), previous searches BBHs filtered using only where both spins are zero. This leads loss signal-to-noise ratio signals this is not case. Combining best available placement techniques...
Strong gravitational lensing can produce multiple images of the same gravitational-wave signal, each arriving at different times and with magnification. Previous work has explored if lensed pairs exist among known high-significance events found no evidence this. However, possibility remains that weaker counterparts these are present in data, unrecovered by previous searches. We conduct a targeted search specifically looking for sub-threshold binary black hole (BBH) observations. recover...
The next generation of ground-based gravitational-wave detectors will observe coalescences black holes and neutron stars throughout the cosmos, thousands them with exceptional fidelity. Science Book is result a 3-year effort to study science capabilities networks detectors. Such would make it possible address unsolved problems in numerous areas physics astronomy, from Cosmology Beyond Standard Model particle physics, how they could provide insights into workings strongly gravitating systems,...