A5056471677- Pulsars and Gravitational Waves Research
- Geophysics and Sensor Technology
- Seismic Waves and Analysis
- Mechanical and Optical Resonators
- Gamma-ray bursts and supernovae
- Advanced Frequency and Time Standards
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Atomic and Subatomic Physics Research
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Cold Atom Physics and Bose-Einstein Condensates
- Semiconductor Lasers and Optical Devices
- Seismology and Earthquake Studies
- High-pressure geophysics and materials
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Coenzyme Q10 studies and effects
- Advanced Measurement and Metrology Techniques
- Lipid metabolism and biosynthesis
- Mitochondrial Function and Pathology
- Biochemical effects in animals
- Photosynthetic Processes and Mechanisms
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
University of Oregon
1977-2024
LIGO Scientific Collaboration
2024
Massachusetts Institute of Technology
2024
Health & Life (Taiwan)
2023
University of Colorado Boulder
1998
University of California, San Francisco
1980
United States Department of Veterans Affairs
1980
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...
Quantum noise imposes a fundamental limitation on the sensitivity of interferometric gravitational-wave detectors like LIGO, manifesting as shot and quantum radiation pressure noise. Here, we present first realization frequency-dependent squeezing in full-scale detectors, resulting reduction both noise, with broadband detector enhancement from tens hertz to several kilohertz. In LIGO Hanford detector, reduced amplitude by factor 1.6 (4.0 dB) near 1 kHz; Livingston was 1.9 (5.8 dB). These...
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...
We report on a search for compact binary coalescences where at least one component has mass between $0.2\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$ and $1.0\text{ in Advanced LIGO Virgo data collected 1 April 2019 1500 UTC October UTC. extend our previous analyses two main ways: we include from the detector allow more unequal systems, with ratio $q\ensuremath{\ge}0.1$. do not any gravitational-wave candidates. The most significant trigger false alarm rate of $0.14\text{...
A preparation has been made from Complex I1 of beef heart mitochondria which contains in purified form two peptides, designated CItw3 and Ctt-4, with molecular weights 13,500 7,000, respectively.Recombination soluble succinate dehydrogenase the peptides elicits ubiquinone reductase activity and, 111, antimycin-sensitive cytochrome c activity, while "low K,"-ferricyanide (Vinogradov, A. D., Gavrikova, E. V., Goloveshkina, V. G .(1975) Biochem Biophys.Res.Commun.65, 1264-1269) is lost.A ratio...
Gravitational Wave interferometers achieve their profound sensitivity by combining a Michelson interferometer with optical cavities, suspended masses, and now, squeezed quantum states of light. These modify the measurement process LIGO, VIRGO GEO600 to reduce noise that masks astrophysical signals; thus, improvements squeezing are essential further expand our gravitational view universe. Further reducing will require both lowering decoherence from losses as well more sophisticated...
We report Earth-scale distance magnetic correlations from lightning strokes in the frequency range 1-1000 Hz at several distances ranging 1100 to 9000 km. Noise sources which are correlated on can affect future searches for gravitational-wave signals with ground-based interferometric detectors. consider impact of field fluctuations due Schumann resonances ($<$50 Hz) as well higher frequencies ($>$100 Hz). demonstrate that individual a likely source observed observatories and discuss some...
Progress in gravitational-wave astronomy depends upon having sensitive detectors with good data quality. Since the end of LIGO-Virgo-KAGRA third Observing run March 2020, detector-characterization efforts have lead to increased sensitivity detectors, swifter validation candidates and improved tools used for data-quality products. In this article, we discuss these detail their impact on our ability detect study gravitational-waves. These include multiple instrumental investigations that led...
Precision measurements of space and time, like those made by the detectors Laser Interferometer Gravitational-wave Observatory (LIGO), are often confronted with fundamental limitations imposed quantum mechanics. The Heisenberg uncertainty principle dictates that position momentum an object cannot both be precisely measured, giving rise to apparent limitation called Standard Quantum Limit (SQL). Reducing noise below SQL in gravitational-wave detectors, where photons used continuously measure...
The Heisenberg uncertainty principle dictates that the position and momentum of an object cannot be simultaneously measured with arbitrary precision, giving rise to apparent limitation known as standard quantum limit (SQL). Gravitational-wave detectors use photons continuously measure positions freely falling mirrors so are affected by SQL. We investigated performance Laser Interferometer Gravitational-Wave Observatory (LIGO) after experimental realization frequency-dependent squeezing...
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...
ABSTRACT Magnetar vibrational modes are theorized to be associated with energetic X-ray flares. Regular searches for gravitational waves from these have been performed by Advanced LIGO (Laser Interferometer Gravitational-wave Observatory) and Virgo, no detections so far. Presently, search results given in upper limits on the root sum square of integrated gravitational-wave strain. However, increased sensitivity current detectors promise future invite consideration more astrophysically...
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...
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 program couple combines simulators for optical performance, mechanical reliability, and production cost under a graphical-user interface to design, simulate, evaluate micro-optomechanical structures. thermal simulator predicts the package temperature distribution on basis of materials geometry as well heat sources, sinks, boundary conditions. is input simulator, which calculates stresses or strains displacements caused by differential expansion. impact efficiency cross talk parameter...
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...
Magnetar vibrational modes are theorized to be associated with energetic X-ray flares. Regular searches for gravitational waves from these have been performed by Advanced LIGO and Virgo, no detections so far. Presently, search results given in limits on the root-sum-square of integrated gravitational-wave strain. However, increased sensitivity current detectors promise future invite consideration more astrophysically motivated methods. We present a framework augmenting wave measure or place...