L. E. H. Datrier
A5051253728- 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
- Astrophysics and Cosmic Phenomena
- High-pressure geophysics and materials
- Radio Astronomy Observations and Technology
- Atomic and Subatomic Physics Research
- Seismic Waves and Analysis
- Mechanical and Optical Resonators
- Astronomical Observations and Instrumentation
- Superconducting Materials and Applications
- Statistical and numerical algorithms
- Advanced Frequency and Time Standards
- Adaptive optics and wavefront sensing
- Black Holes and Theoretical Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Seismology and Earthquake Studies
- Magnetic confinement fusion research
- Mechanics and Biomechanics Studies
- Experimental and Theoretical Physics Studies
- Inertial Sensor and Navigation
- GNSS positioning and interference
University of Glasgow
2017-2024
The Laser Interferometer Gravitational Wave Observatory (LIGO) has been directly detecting gravitational waves from compact binary mergers since 2015. We report on the first use of squeezed vacuum states in direct measurement with Advanced LIGO H1 and L1 detectors. This achievement is culmination decades research to implement gravitational-wave During ongoing O3 observation run, are improving sensitivity interferometers signals above 50 Hz by up 3 dB, thereby increasing expected detection...
On April 1st, 2019, the Advanced Laser Interferometer Gravitational-Wave Observatory (aLIGO), joined by Virgo detector, began third observing run, a year-long dedicated search for gravitational radiation. The LIGO detectors have achieved higher duty cycle and greater sensitivity to waves than ever before, with Hanford achieving angle-averaged binary neutron star coalescences distance of 111 Mpc, Livingston 134 Mpc factors 74.6% 77.0% respectively. improvement in stability is result several...
Abstract We perform a statistical standard siren analysis of GW170817. Our does not utilize knowledge NGC 4993 as the unique host galaxy optical counterpart to Instead, we consider each within GW170817 localization region potential host; combining redshifts from all galaxies with distance estimate provides an Hubble constant, H 0 . Considering brighter than equally likely binary neutron star merger, find km s −1 Mpc (maximum posteriori and 68.3% highest density posterior interval; assuming...
The characterization of the Advanced LIGO detectors in second and third observing runs has increased sensitivity instruments, allowing for a higher number detectable gravitational-wave signals, provided confirmation all observed events. In this work, we present methods used to characterize curate publicly available datasets, including strain data quality products. We describe essential role these datasets LIGO-Virgo Collaboration analyses gravitational-waves from both transient persistent...
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,...
The motion of a mechanical object, even human-sized should be governed by the rules quantum mechanics. Coaxing them into state is, however, difficult because thermal environment masks any signature object's motion. also effects proposed modifications mechanics at large mass scales. We prepared center-of-mass 10-kilogram oscillator in with an average phonon occupation 10.8. reduction temperature, from room temperature to 77 nanokelvin, is commensurate 11 orders-of-magnitude suppression...
The discovery of the electromagnetic counterpart to binary neutron star merger GW170817 has opened era gravitational-wave multi-messenger astronomy. Rapid identification optical/infrared kilonova enabled a precise localization source, which paved way deep multi-wavelength follow-up and its myriad related science results. Fully exploiting this new territory exploration requires acquisition data from samples mergers other gravitational wave sources. After GW170817, frontier is now map...
We present the application of a robust test galaxy catalogue completeness to gwcosmo pipeline. The method implements straightforward statistical for determining apparent magnitude limit magnitude-redshift sample. This offers an improved, less conservative approach compared with how is currently estimated in gravitational wave cosmology pipeline Hubble constant $H_{0}$. also does not require prior knowledge luminosity function, and thus returns more estimate limiting sample galaxies. For...
Gravitational Wave interferometers achieve their profound sensitivity by combining a Michelson interferometer with optical cavities, suspended masses, and now, squeezed quantum states of light. These modify the measurement process LIGO, VIRGO GEO600 to reduce noise that masks astrophysical signals; thus, improvements squeezing are essential further expand our gravitational view universe. Further reducing will require both lowering decoherence from losses as well more sophisticated...
Noise due to scattered light has been a frequent disturbance in the Advanced LIGO gravitational wave detectors, hindering detection of waves. The non stationary scatter noise caused by low frequency motion can be recognized as arches time-frequency plane channel. In this paper, we characterize scattering for LIGO's third observing run O3 from April, 2019 March, 2020. We find at least two different populations and investigate multiple origins one them well its mitigation. that relative...
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)...
Abstract The discovery of the optical counterpart, along with gravitational waves (GWs) from GW170817, first binary neutron star merger has opened up a new era for multimessenger astrophysics. Combining GW data also known as AT 2017gfo and classified kilonova, revealed nature compact merging systems by extracting enriched information about total mass, mass ratio, system geometry, equation state. Even though detection kilonovae brought revolution in domain astronomy, there been only one...
Teleseismic, or distant, earthquakes regularly disrupt the operation of ground--based gravitational wave detectors such as Advanced LIGO. Here, we present \emph{EQ mode}, a new global control scheme, consisting an automated sequence optimized filters that reduces and coordinates motion seismic isolation platforms during earthquakes. This, in turn, suppresses differential interferometer arms with respect to one another, resulting reduction DARM signal at frequencies below 100\,mHz. Our method...
The precise calibration of the strain readout LIGO gravitational wave observatories is paramount to accurate interpretation events. This traditionally done by imparting a known force on test masses observatory via radiation pressure. Here, we describe implementation an alternative scheme: Newtonian calibrator. system uses rotor consisting both quadrupole and hexapole mass distributions apply time-varying one observatory's masses. produced this can be predicted $<1%$ relative uncertainty well...
Small, highly absorbing points are randomly present on the surfaces of main interferometer optics in Advanced LIGO. The resulting nano-meter scale thermo-elastic deformations and substrate lenses from these micron-scale absorbers significantly reduces sensitivity directly though a reduction power-recycling gain indirect interactions with feedback control system. We review expected surface deformation point provide pedagogical description impact power build-up second generation gravitational...
The sensitivity of the Advanced LIGO detectors to gravitational waves can be affected by environmental disturbances external themselves. Since transition from former initial phase, many improvements have been made equipment and techniques used investigate these effects. These methods aided in tracking down mitigating noise sources throughout first three observing runs advanced detector era, keeping ambient contribution below background levels detectors. In this paper we describe how they led...
Advanced LIGO and Virgo have detected gravitational waves from astronomical sources to open a new window on the Universe. To explore this realm requires an exquisite level of detector sensitivity, meaning that much stronger signal instrumental environmental noise must be rejected. Selected examples unwanted in are presented. The initial focus is how existence (characterized by particular frequencies or time intervals) was discovered. Then, variety methods used track down source noise, e.g.,...
The precisions of existing gravitational calibrators for wave observatories are limited by their dependence on the relative position between and observatory's test masses. Here we present a novel geometry consisting four quadrupole rotors placed at vertices rectangle centered mass. phases rotation directions selected to produce pseudoplane-wave sinusoidal acceleration with amplitude $\ensuremath{\sim}100\text{ }\text{ }\mathrm{fm}/{\mathrm{s}}^{2}$. We show that this only has minimal mass...
High-quality optical resonant cavities require low loss, typically on the scale of parts per million. However, unintended micron-scale contaminants resonator mirrors that absorb light circulating in cavity can deform surface thermoelastically and thus increase losses by scattering out mode. The point absorber effect is a limiting factor some high-power experiments, for example, Advanced LIGO gravitational-wave detector. In this Letter, we present general approach to from first principles...
The discovery of the optical counterpart, along with gravitational waves from GW170817, first binary neutron star merger, opened up a new era for multi-messenger astrophysics. Combining GW data also known as AT2017gfo, classified kilonova, has revealed nature compact merging systems by extracting enriched information about total mass, mass ratio, system geometry, and equation state. Even though detection kilonova brought revolution in domain astronomy, since there been only one wave detected...
The precise calibration of the strain readout LIGO gravitational wave observatories is paramount to accurate interpretation events. This traditionally done by imparting a known force on test masses observatory via radiation pressure. Here we describe implementation an alternative scheme: Newtonian Calibrator. system uses rotor consisting both quadrupole and hexapole mass distributions apply time-varying one observatory's masses. produced this can be predicted $<1\%$ relative uncertainty...