S. M. Scott
A5114374896- 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
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Seismic Waves and Analysis
- Radio Astronomy Observations and Technology
- High-pressure geophysics and materials
- Advanced Frequency and Time Standards
- Legal Issues in South Africa
- Atomic and Subatomic Physics Research
- Statistical and numerical algorithms
- Noncommutative and Quantum Gravity Theories
- Neonatal Respiratory Health Research
- Relativity and Gravitational Theory
- Astronomical Observations and Instrumentation
- Cold Atom Physics and Bose-Einstein Condensates
- Fiscal Policy and Economic Growth
- Seismology and Earthquake Studies
- Comparative and International Law Studies
- Geometric Analysis and Curvature Flows
- Legal principles and applications
ARC Centre of Excellence for Gravitational Wave Discovery
2017-2024
Australian National University
2015-2024
Louisiana State University
2021-2024
Women of Color Breast Cancer Survivors' Support Project
2023
Australian Research Council
2017-2023
ExxonMobil (Germany)
2022
Endo Pharmaceuticals (United States)
2022
University of Florida
2019-2021
Florey Institute of Neuroscience and Mental Health
2020
The University of Melbourne
2020
On May 21, 2019 at 03:02:29 UTC Advanced LIGO and Virgo observed a short duration gravitational-wave signal, GW190521, with three-detector network signal-to-noise ratio of 14.7, an estimated false-alarm rate 1 in 4900 yr using search sensitive to generic transients. If GW190521 is from quasicircular binary inspiral, then the detected signal consistent merger two black holes masses 85_{-14}^{+21} M_{⊙} 66_{-18}^{+17} (90% credible intervals). We infer that primary hole mass lies within gap...
Objective. The development of bronchopulmonary dysplasia (BPD) often has been attributed to injury from mechanical ventilation and supplemental oxygen. Early lung inflammation in infants with BPD thought be secondary these factors. purpose this study was evaluate whether preexisting (prenatal) may a primary causative factor the BPD. Methods. Intubated newborns less than 2000 g birth weight were prospectively enrolled. presence or absence chorioamnionitis documented. Lung evaluated on days 1,...
We report on the population of 47 compact binary mergers detected with a false-alarm rate 1/yr in second LIGO--Virgo Gravitational-Wave Transient Catalog, GWTC-2. observe several characteristics merging black hole (BBH) not discernible until now. First, we find that primary mass spectrum contains structure beyond power-law sharp high-mass cut-off; it is more consistent broken power law break at $39.7^{+20.3}_{-9.1}\,M_\odot$, or Gaussian feature peaking $33.1^{+4.0}_{-5.6}\,M_\odot$ (90\%...
We report the observation of gravitational waves from two compact binary coalescences in LIGO's and Virgo's third observing run with properties consistent neutron star-black hole (NSBH) binaries. The events are named GW200105_162426 GW200115_042309, abbreviated as GW200105 GW200115; first was observed by LIGO Livingston Virgo, second all three LIGO-Virgo detectors. source has component masses $8.9^{+1.2}_{-1.5}\,M_\odot$ $1.9^{+0.3}_{-0.2}\,M_\odot$, whereas GW200115...
Gravitational waves enable tests of general relativity in the highly dynamical and strong-field regime. Using events detected by LIGO-Virgo up to 1 October 2019, we evaluate consistency data with predictions from theory. We first establish that residuals best-fit waveform are consistent detector noise, low- high-frequency parts signals agreement. then consider parametrized modifications varying post-Newtonian phenomenological coefficients, improving past constraints factors ${\sim}2$; also...
On 2019 April 25, the LIGO Livingston detector observed a compact binary coalescence with signal-to-noise ratio 12.9. The Virgo was also taking data that did not contribute to detection due low ratio, but were used for subsequent parameter estimation. 90% credible intervals component masses range from 1.12 2.52 $M_{\odot}$ (1.45 1.88 if we restrict dimensionless spin magnitudes be smaller than 0.05). These mass parameters are consistent individual components being neutron stars. However,...
We report on gravitational wave discoveries from compact binary coalescences detected by Advanced LIGO and Virgo in the first half of third observing run (O3a) between 1 April 2019 15:00 UTC October 15:00. By imposing a false-alarm-rate threshold two per year each four search pipelines that constitute our search, we present 39 candidate events. At this threshold, expect contamination fraction less than 10%. Of these, 26 events were reported previously near real-time through GCN Notices...
Abstract We report the observation of a compact binary coalescence involving 22.2–24.3 M ⊙ black hole and object with mass 2.50–2.67 (all measurements quoted at 90% credible level). The gravitational-wave signal, GW190814, was observed during LIGO’s Virgo’s third observing run on 2019 August 14 21:10:39 UTC has signal-to-noise ratio 25 in three-detector network. source localized to 18.5 deg 2 distance Mpc; no electromagnetic counterpart been confirmed date. most unequal yet measured...
We report on the population properties of compact binary mergers inferred from gravitational-wave observations these systems during first three LIGO-Virgo observing runs. The Gravitational-Wave Transient Catalog 3 (GWTC-3) contains signals consistent with classes mergers: black hole, neutron star, and star–black hole mergers. infer star merger rate to be between 10 <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>1700</a:mn><a:mtext> </a:mtext><a:mtext>...
We report results of a search for an isotropic gravitational-wave background (GWB) using data from Advanced LIGO's and Virgo's third observing run (O3) combined with upper limits the earlier O1 O2 runs. Unlike in previous runs advanced detector era, we include Virgo GWB. The are consistent uncorrelated noise, therefore place on strength find that dimensionless energy density $\Omega_{\rm GW}\leq 5.8\times 10^{-9}$ at 95% credible level flat (frequency-independent) GWB, prior which is uniform...
This paper presents the gravitational-wave measurement of Hubble constant ($H_0$) using detections from first and second observing runs Advanced LIGO Virgo detector network. The presence transient electromagnetic counterpart binary neutron star GW170817 led to standard-siren $H_0$. Here we additionally use black hole in conjunction with galaxy catalogs report a joint measurement. Our updated is $H_0 = 68.7^{+17.0}_{-7.8}$ km/s/Mpc (68.3\% highest density posterior interval flat-in-log prior)...
The second Gravitational-Wave Transient Catalog, GWTC-2, reported on 39 compact binary coalescences observed by the Advanced LIGO and Virgo detectors between 1 April 2019 15∶00 UTC October UTC. Here, we present GWTC-2.1, which reports a deeper list of candidate events over same period. We analyze final version strain data this period with improved calibration better subtraction excess noise, has been publicly released. employ three matched-filter search pipelines for identification, estimate...
The second Gravitational-Wave Transient Catalog reported on 39 compact binary coalescences observed by the Advanced LIGO and Virgo detectors between 1 April 2019 15:00 UTC October UTC. We present GWTC-2.1, which reports a deeper list of candidate events over same period. analyze final version strain data this period with improved calibration better subtraction excess noise, has been publicly released. employ three matched-filter search pipelines for identification, estimate astrophysical...
The gravitational-wave signal GW190521 is consistent with a binary black hole merger source at redshift 0.8 unusually high component masses, $85^{+21}_{-14}\,M_{\odot}$ and $66^{+17}_{-18}\,M_{\odot}$, compared to previously reported events, shows mild evidence for spin-induced orbital precession. primary falls in the mass gap predicted by (pulsational) pair-instability supernova theory, approximate range $65 - 120\,M_{\odot}$. probability that least one of holes 99.0%. final...
The global network of gravitational-wave observatories now includes five detectors, namely LIGO Hanford, Livingston, Virgo, KAGRA, and GEO 600. These detectors collected data during their third observing run, O3, composed three phases: O3a starting in April 2019 lasting six months, O3b November O3GK 2020 2 weeks. In this paper we describe these various other science products that can be freely accessed through the Gravitational Wave Open Science Center at https://gwosc.org. main dataset,...
The discovery of the first electromagnetic counterpart to a gravitational wave signal has generated follow-up observations by over 50 facilities world-wide, ushering in new era multi-messenger astronomy. In this paper, we present event GW170817 and its SSS17a/DLT17ck (IAU label AT2017gfo) 14 Australian telescopes partner observatories as part Australian-based Australian-led research programs. We report early- late-time multi-wavelength observations, including optical imaging spectroscopy,...
A search for gravitational-wave signals produced by cosmic strings in the Advanced LIGO and Virgo full O3 data set improve upon previous LIGO-Virgo constraints on G\ensuremath{\mu} one to two orders of magnitude, depending model which is tested.
Advanced LIGO and Virgo are monitoring the sky collecting gravitational-wave strain data with sufficient sensitivity to detect signals routinely. In this paper we describe recorded by these instruments during their first second observing runs. The main products time series sampled at 16384 Hz. datasets that include measurement can be freely accessed through Gravitational Wave Open Science Center http://gw-openscience.org, together data-quality information essential for analysis of data,...
We use 47 gravitational-wave sources from the Third LIGO-Virgo-KAGRA Gravitational-Wave Transient Catalog (GWTC-3) to estimate Hubble parameter $H(z)$, including its current value, constant $H_0$. Each (GW) signal provides luminosity distance source and we corresponding redshift using two methods: redshifted masses a galaxy catalog. Using binary black hole (BBH) masses, simultaneously infer mass distribution $H(z)$. The displays peak around $34\, {\rm M_\odot}$, followed by drop-off....
We search for signatures of gravitational lensing in the gravitational-wave signals from compact binary coalescences detected by Advanced LIGO and Virgo during O3a, first half their third observing run. study: 1) expected rate at current detector sensitivity implications a non-observation strong or stochastic background on merger-rate density high redshift; 2) how interpretation individual high-mass events would change if they were found to be lensed; 3) possibility multiple images due...
We present results of an all-sky search for continuous gravitational waves which can be produced by spinning neutron stars with asymmetry around their rotation axis, using data from the third observing run Advanced LIGO and Virgo detectors. Four different analysis methods are used to in a gravitational-wave frequency band 10 2048 Hz first derivative $-10^{-8}$ $10^{-9}$ Hz/s. No statistically-significant periodic signal is observed any four searches. As result, upper limits on strain...
To test the cortisol response to adrenocorticotrophic hormone (ACTH) in a population of very low birth weight newborns at end first week life, and evaluate relationship this subsequent development bronchopulmonary dysplasia total length oxygen dependence.Appropriate for gestational age < 1500 g were enrolled prospectively. Response ACTH stimulation was tested on days 5, 6, or 7. Baseline cortisol, stimulated magnitude compared between babies who developed (BPD), defined as dependence 28...
Study Design A cohort of 1848 workers, representative all sectors industry, who were compensated for a low back injury in 1988 but not the previous 2 years, was followed over 24 months. Objectives To determine prognostic value physician's initial diagnosis problems. Summary Background Data In absence standardized classification diagnoses pain, this study aimed to provide an element validity previously proposed that consists "specific" and "nonspecific" pain. Methods Medical charts reviewed...
When formed through dynamical interactions, stellar-mass binary black holes may retain eccentric orbits ($e>0.1$ at 10 Hz) detectable by ground-based gravitational-wave detectors. Eccentricity can therefore be used to differentiate dynamically-formed binaries from isolated hole mergers. Current template-based searches do not use waveform models associated orbits, rendering the search less efficient systems. Here we present results of a for mergers that inspiral in using data first and second...