A5102974674- 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
- Geophysics and Sensor Technology
- Seismic Waves and Analysis
- Radio Astronomy Observations and Technology
- Statistical and numerical algorithms
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Advanced Frequency and Time Standards
- Seismic Imaging and Inversion Techniques
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Quantum Chromodynamics and Particle Interactions
- Astronomical Observations and Instrumentation
- Cold Atom Physics and Bose-Einstein Condensates
- earthquake and tectonic studies
- Stellar, planetary, and galactic studies
- Seismology and Earthquake Studies
- Particle Accelerators and Free-Electron Lasers
- Adaptive optics and wavefront sensing
Massachusetts Institute of Technology
2019-2025
Kavli Institute for Particle Astrophysics and Cosmology
2019-2025
University of Nevada, Las Vegas
2023-2025
University of Nevada, Reno
2024-2025
Campbell Collaboration
2023
University of Birmingham
2013-2021
University of Toronto
2017-2020
Canadian Institute for Theoretical Astrophysics
2017-2020
Northwestern University
2015
The Advanced LIGO and Virgo gravitational wave (GW) detectors will begin operation in the coming years, with compact binary coalescence events a likely source for first detections. waveforms emitted directly encode information about sources, including masses spins of objects. Recovering physical parameters sources from GW observations is key analysis task. This work describes LALInference software library Bayesian parameter estimation signals, which builds on several previous methods to...
The predicted rate of binary black hole mergers from galactic fields can vary over several orders magnitude and is extremely sensitive to the assumptions stellar evolution. But in dense environments such as globular clusters, holes form by well-understood gravitational interactions. In this Letter, we study formation binaries an extensive collection realistic cluster models. By comparing these models observed Milky Way extragalactic find that dynamically formed could be detected at a ∼100...
This paper explores the accuracy with which gravitational waves emitted in coalescence of compact binaries need to be computed so that inference binary parameters from wave events will not affected by systematic biases.
Abstract This review aims at providing an extensive discussion of modern constraints relevant for dense and hot strongly interacting matter. It includes theoretical first-principle results from lattice perturbative QCD, as well chiral effective field theory results. From the experimental side, it heavy-ion collision low-energy nuclear physics results, observations neutron stars their mergers. The validity different constraints, concerning specific conditions ranges applicability, is also provided.
Inferring astrophysical information from gravitational waves emitted by compact binaries is one of the key science goals gravitational-wave astronomy. In order to reach full scientific potential experiments, we require techniques mitigate cost Bayesian inference, especially as signal models and analyses become increasingly sophisticated detailed. Reduced-order (ROMs) waveforms can significantly reduce computational inference removing redundant computations. this paper, construct first...
We explore the possibility that GW150914, binary black hole merger recently detected by Advanced LIGO, was formed gravitational interactions in core of a dense star cluster. Using models globular clusters with detailed $N$-body dynamics and stellar evolution, we show typical cluster mass $3\times10^5M_{\odot}$ to $6\times10^5M_{\odot}$ is optimal for forming GW150914-like holes will merge local universe. identify most likely dynamical processes GW150914 such cluster, detection consistent...
We anticipate the first direct detections of gravitational waves (GWs) with Advanced LIGO and Virgo later this decade. Though groundbreaking technical achievement will be its own reward, a still greater prize could observations compact binary mergers in both electromagnetic channels simultaneously. During Virgo's two years operation, 2015 through 2016, we expect global GW detector array to improve sensitivity livetime expand from three detectors. model detection rate sky localization...
Advanced ground-based gravitational-wave (GW) detectors begin operation imminently. Their intended goal is not only to make the first direct detection of GWs, but also inferences about source systems. Binary neutron-star mergers are among most promising sources. We investigate performance parameter-estimation \edit{(PE)} pipeline that will be used during observing run Laser Interferometer Gravitational-wave Observatory (aLIGO) in 2015: we concentrate on ability reconstruct location sky,...
Gravitational wave measurements of binary neutron star coalescences offer information about the properties extreme matter that comprises stars. Despite our expectation all stars in Universe obey same equation state, i.e. forms them are universal, current tidal inference analyses treat two bodies as independent. We present a method to measure effect interactions gravitational signal---and hence constrain state---that assumes components state. Our makes use relation between deformabilities...
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...
Gravitational waves emitted by coalescing compact objects carry information about the spin of individual bodies. However, with present detectors only mass-weighted combination components along orbital angular momentum can be measured accurately. This quantity, effective ${\ensuremath{\chi}}_{\mathrm{eff}}$, is conserved up to at least second post-Newtonian order. The distribution ${\ensuremath{\chi}}_{\mathrm{eff}}$ values from a population detected binaries, and in particular whether this...
We present the first systematic study of strong binary-single and binary-binary black hole interactions with inclusion general relativity. When including relativistic effects in encounters, dissipation orbital energy from gravitational waves (GWs) can lead to captures subsequent inspirals appreciable eccentricities when entering sensitive frequency ranges LIGO Virgo GW detectors. In this study, we perform scattering experiments dynamics up through 2.5 post-Newtonian order included, both a...
Hierarchical analysis of the binary black hole (BBH) detections by Advanced LIGO and Virgo detectors has offered an increasingly clear picture their mass, spin, redshift distributions. Fully understanding formation evolution BBH mergers will require not just characterization these marginal distributions, though, but discovery any correlations that exist between properties BBHs. Here, we hierarchically analyze ensemble BBHs discovered with a model allows for intrinsic mass ratios $q$...
In the coming years gravitational-wave detectors will undergo a series of improvements, with an increase in their detection rate by about order magnitude. Routine detections signals promote novel astrophysical and fundamental theory studies, while simultaneously leading to number temporally overlapping instrumentally- or environmentally-induced transients (glitches), often unknown origin. Indeed, this was case for very first LIGO Virgo signal consistent binary neutron star coalescence,...
Stellar triples with massive stellar components are common, and can lead to sequential binary black-hole mergers. Here, we outline the evolution towards these mergers, explore events in context of gravitational-wave astronomy pair-instability mass gap. We find that mergers gap be triple origin therefore not exclusively formed dense dynamical environments. discuss merger scenario most sources detected date: GW170729 GW190521. propose progenitor is a low-metallicity field triple. support...
The final black hole left behind after a binary merger can attain recoil velocity, or "kick," reaching values up to 5000 km/s. This phenomenon has important implications for gravitational wave astronomy, formation scenarios, testing general relativity, and galaxy evolution. We consider the signal from GW200129_065458 (henceforth referred as GW200129), which been shown exhibit strong evidence of orbital precession. Using numerical relativity surrogate models, we constrain kick velocity...
The population-level distributions of the masses, spins, and redshifts binary black holes (BBHs) observed using gravitational waves can shed light on how these systems form evolve. Because complex astrophysical processes shaping inferred BBH population, models allowing for correlations among parameters will be necessary to fully characterize sources. We hierarchically analyze population detected by LIGO Virgo with a model between effective aligned spin primary mass redshift. find that width...
The post-Newtonian formalism plays an integral role in the models used to extract information from gravitational wave data, but that incorporate this are inherently approximations. Disagreement between approximate model and nature will produce mismodeling biases parameters inferred introducing systematic error. We here carry out a proof-of-principle study of such error by considering signals produced quasicircular, inspiraling black hole binaries through injection recovery campaign. In...
Abstract Gravitational-wave observations by the laser interferometer gravitational-wave observatory (LIGO) and Virgo have provided us a new tool to explore Universe on all scales from nuclear physics cosmos massive potential further impact fundamental physics, astrophysics, cosmology for decades come. In this paper we studied science capabilities of network LIGO detectors when they reach their best possible sensitivity, called A <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In a regime where data are only mildly informative, prior choices can play significant role in Bayesian statistical inference, potentially affecting the inferred physics. We show this is indeed case for some of parameters from current gravitational-wave measurements binary black hole coalescences. reanalyze first detections performed by twin LIGO interferometers using alternative (and astrophysically motivated) assumptions. find different distributions introduce deviations resulting...
Inspiraling binary neutron stars are expected to be one of the most significant sources gravitational-wave signals for new generation advanced ground-based detectors. We investigate how well we could hope measure properties these binaries using Advanced LIGO detectors, which began operation in September 2015. study an astrophysically motivated population (binary components with masses $1.2~\mathrm{M}_\odot$--$1.6~\mathrm{M}_\odot$ and spins less than $0.05$) full analysis pipeline. While...
The thermodynamic relation between pressure and density (i.e. the equation of state) cold supranuclear matter is critical in describing neutron stars, yet it remains one largest uncertainties nuclear physics. extraction tidal deformabilities from gravitational waves emitted coalescence star binaries, such as GW170817, a promising tool to probe this relation. Equation-of-state insensitive relations symmetric antisymmetric combinations individual deformabilities, so-called "binary Love...
Estimating the parameters of gravitational wave signals detected by ground-based detectors requires an understanding properties detectors' noise. In particular, most commonly used likelihood function for data analysis assumes that noise is Gaussian, stationary, and known frequency-dependent variance. The variance colored Gaussian as a whitening filter on before computation function. practice not it evolves over timescales dozens seconds to minutes. We study two methods estimating this with...
Gravitational wave observations of large mass ratio compact binary mergers like GW190814 highlight the need for reliable, high-accuracy waveform templates such systems. We present nrhybsur2dq15, a new surrogate model trained on hybridized numerical relativity (NR) waveforms with ratios $q\ensuremath{\le}15$ and aligned spins $|{\ensuremath{\chi}}_{1z}|\ensuremath{\le}0.5$ ${\ensuremath{\chi}}_{2z}=0$. target parameter space GW190814-like events as NR simulations are very expensive. The...