A5038172029- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- High-pressure geophysics and materials
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Seismic Waves and Analysis
- Geophysics and Sensor Technology
- Statistical and numerical algorithms
- Atomic and Subatomic Physics Research
- Astronomical Observations and Instrumentation
- Black Holes and Theoretical Physics
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Seismology and Earthquake Studies
- Advanced Frequency and Time Standards
- earthquake and tectonic studies
- Cold Atom Physics and Bose-Einstein Condensates
- Neutrino Physics Research
- Seismic Imaging and Inversion Techniques
- Adaptive optics and wavefront sensing
Cardiff University
2016-2024
Utrecht University
2021-2024
University of Amsterdam
2021-2024
National Institute for Subatomic Physics
2021-2024
Chennai Mathematical Institute
2015-2017
Gravitational-wave observations of binary black holes currently rely on theoretical models that predict the dominant multipoles (ℓ=2,|m|=2) radiation during inspiral, merger, and ringdown. We introduce a simple method to include subdominant hole gravitational waveforms, given frequency-domain model for multipoles. The amplitude phase original are appropriately stretched rescaled using post-Newtonian results (for inspiral), perturbation theory ringdown), smooth transition between two. No...
Abstract The Einstein Telescope (ET), the European project for a third-generation gravitational-wave detector, has reference configuration based on triangular shape consisting of three nested detectors with 10 km arms, where each detector 'xylophone' made an interferometer tuned toward high frequencies, and low frequencies working at cryogenic temperature. Here, we examine scientific perspectives under possible variations this design. We perform detailed evaluation science case single...
We present a public catalog of numerical-relativity binary-black-hole simulations. The contains datasets from 80 distinct configurations precessing systems, with mass ratios up to <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>m</a:mi><a:mn>2</a:mn></a:msub><a:mo>/</a:mo><a:msub><a:mi>m</a:mi><a:mn>1</a:mn></a:msub><a:mo>=</a:mo><a:mn>8</a:mn></a:math>, dimensionless spin magnitudes on the larger black hole <c:math...
We present PhenomPNR, a frequency-domain phenomenological model of the gravitational-wave (GW) signal from binary-black-hole mergers that is tuned to numerical relativity (NR) simulations precessing binaries. In many current waveform models, e.g., "Phenom" and "EOBNR" families have been used extensively analyse LIGO-Virgo GW observations, analytic approximations are add precession effects models non-precessing (aligned-spin) binaries, it only aligned-spin fully NR results. PhenomPNR we...
Gravitational waves from compact binary coalescence sources can be decomposed into spherical-harmonic multipoles, the dominant being quadrupole ($\ell=2, m=\pm2$) modes. The contribution of sub-dominant modes towards total signal power increases with increasing mass ratio and source inclination to detector. It is well-known that in these cases neglecting higher could lead measurement biases, but have not yet been quantified a higher-mode model includes spin effects. In this study, we use...
Gravitational waves provide us with an extraordinary tool to study the matter inside neutron stars. In particular, postmerger signal probes extreme temperature and density regime will help reveal information about equation of state supranuclear-dense matter. Although current detectors are most sensitive emitted by binary stars before merger, upgrades existing construction next generation make detections feasible. For this purpose, we present a new analytical, frequency-domain model for...
We present a public catalogue of numerical-relativity binary-black-hole simulations. The contains datasets from 80 distinct configurations precessing systems, with mass ratios up to $m_2/m_1 = 8$, dimensionless spin magnitudes on the larger black hole $|\vec{S}_2|/m_2^2 0.8$ (the small is non-spinning), and range five values misalignment for each mass-ratio/spin combination. discuss physical properties in our catalogue, assess accuracy initial configuration simulation gravitational...
In gravitational-wave observations of binary black holes (BBHs), theoretical waveform models are used to infer the black-hole properties. There several sources potential systematic errors in these measurements, including due physical approximations models. One standard approximation is neglect a small asymmetry between $+m$ and $\ensuremath{-}m$ spherical-harmonic modes; this effect that leads emission linear momentum perpendicular orbital plane, can result large recoils final hole. The...
Recently, strong evidence was found for the presence of higher-order modes in gravitational wave signals GW190412 and GW190814, which originated from compact binary coalescences with significantly asymmetric component masses. This has opened up possibility new tests general relativity by looking at way are related to basic signal. Here we further develop a test assesses whether amplitudes subdominant harmonics consistent what is predicted relativity. To this end incorporate state-of-the-art...
We introduce a machine learning model designed to rapidly and accurately predict the time domain gravitational wave emission of nonprecessing binary black hole coalescences, incorporating effects higher order modes multipole expansion waveform. Expanding on our prior work [Phys. Rev. D 103, 043020 (2021)], we decompose each mode by amplitude phase reduce dimensionality using principal component analysis. An ensemble artificial neural networks is trained learn relationship between orbital...
Searches for gravitational waves (GWs) from binary black holes using interferometric GW detectors require the construction of template banks performing matched filtering while analyzing data. Placement templates over parameter space binaries, as well coincidence tests triggers multiple make use definition a metric waveforms. Although recent searches have employed waveform coherently describing inspiral, merger and ringdown (IMR) coalescence, used in was derived post-Newtonian inspiral In...
We introduce a machine learning model designed to rapidly and accurately predict the time domain gravitational wave emission of non-precessing binary black hole coalescences, incorporating effects higher order modes multipole expansion waveform. Expanding on our prior work, we decompose each mode by amplitude phase reduce dimensionality using principal component analysis. An ensemble artificial neural networks is trained learn relationship between orbital parameters low-dimensional...
Recently, strong evidence was found for the presence of higher-order modes in gravitational wave signals GW190412 and GW190814, which originated from compact binary coalescences with significantly asymmetric component masses. This has opened up possibility new tests general relativity by looking at way are related to basic signal. Here we further develop a test assesses whether amplitudes sub-dominant harmonics consistent what is predicted relativity. To this end incorporate state-of-the-art...
Gravitational waves provide us with an extraordinary tool to study the matter inside neutron stars. In particular, postmerger signal probes extreme temperature and density regime will help reveal information about equation of state supranuclear-dense matter. Although current detectors are most sensitive emitted by binary stars before merger, upgrades existing construction next generation make detections feasible. For this purpose, we present a new analytical, frequency-domain model for...