I. S. Heng
A5087926158- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Geophysics and Sensor Technology
- Advanced Frequency and Time Standards
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Statistical and numerical algorithms
- Seismology and Earthquake Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Astronomical Observations and Instrumentation
- Black Holes and Theoretical Physics
- Magnetic confinement fusion research
- Computational Physics and Python Applications
- Stellar, planetary, and galactic studies
- Meteorological Phenomena and Simulations
- Particle Accelerators and Free-Electron Lasers
- Retinal Imaging and Analysis
- Superconducting Materials and Applications
- GNSS positioning and interference
University of Glasgow
2015-2024
Sun Yat-sen University
2023-2024
Wuhan University
2024
Hebei University
2023
University of Florida
2017
Cardiff University
2011
Carleton College
2011
California Institute of Technology
2011
Andrews University
2011
Australian National University
2011
Advanced gravitational wave interferometers, currently under realization, will soon permit the detection of waves from astronomical sources. To open era precision astronomy, a further substantial improvement in sensitivity is required. The future space-based Laser Interferometer Space Antenna and third-generation ground-based observatory Einstein Telescope (ET) promise to achieve required improvements frequency ranges. vastly improved third generation observatories could detailed...
Advanced gravitational wave detectors, currently under construction, are expected to directly observe signals of astrophysical origin. The Einstein Telescope (ET), a third-generation detector, has been proposed in order fully open up the emerging field astronomy. In this paper we describe sensitivity models for ET and investigate potential limits imposed by fundamental noise sources. A special focus is set on evaluating frequency band below 10 Hz where complex mixture seismic, gravity...
Large gravitational wave interferometric detectors, like Virgo and LIGO, demonstrated the capability to reach their design sensitivity, but transform these machines into an effective observational instrument for astronomy a large improvement in sensitivity is required. Advanced detectors near future third-generation observatories more than one decade will open possibility perform astronomical observations from Earth. An overview of possible science reaches technological progress needed...
The advanced interferometer network will herald a new era in observational astronomy. There is very strong science case to go beyond the detector and build detectors that operate frequency range from 1 Hz-10 kHz, with sensitivity factor ten better amplitude. Such be able probe of topics nuclear physics, astronomy, cosmology fundamental providing insights into many unsolved problems these areas.
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum inflation and early universe cosmology, singularities the hierarchy problem---all involve gravity as a key component. And all gravitational phenomena, black holes stand out in their elegant simplicity, while harbouring some most remarkable predictions General Relativity: event horizons, ergoregions. hitherto invisible landscape Universe is being unveiled before our eyes: historical direct detection...
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 introduce a value-added full-sky catalogue of galaxies, named as Galaxy List for the Advanced Detector Era, or GLADE. The purpose this is to (i) help identifications host candidates gravitational-wave events, (ii) support target selections electromagnetic follow-up observations candidates, (iii) provide input data on matter distribution local Universe astrophysical cosmological simulations, and (iv) poorly localized transients, such gamma-ray bursts observed with InterPlanetary Network....
For third generation gravitational wave detectors, such as the Einstein Telescope, signals from binary neutron stars can last up to a few days before merge. To estimate measurement uncertainties of key signal parameters, we develop Fisher matrix approach which accounts for effects on long duration time-dependent detector response and earths rotation. We use this characterize sky localization uncertainty waves at 40, 200, 400, 800 1600Mpc, Telescope Cosmic Explorer individually operating...
A high- $Q$ niobium resonant mass gravitational radiation antenna with a superconducting parametric transducer and noncontacting readout is shown to achieve noise temperature of about 2 mK using zero order predictor filter. The predicted intrinsic cold damping confirmed, along backaction limits on the sensitivity. While has highest factor lowest ever observed in full scale antenna, possibility further improvements demonstrated.
The GEO 600 gravitational wave detector uses advanced technologies including signal recycling and monolithic fused-silica suspensions to achieve a sensitivity close the kilometre scale LIGO VIRGO detectors. As soon as design of is reached, will be operated part worldwide network acquire data scientific interest. limited infrastructure at site does not allow for major upgrade detector. Hence collaboration decided improve by small sequential upgrades some which tested in prototypes first....
Of all the large interferometric gravitational-wave detectors, German/British project GEO600 is only one which uses dual recycling. During four weeks of international S4 data-taking run it reached an instrumental duty cycle 97% with a peak sensitivity 7 × 10−22 Hz−1/2 at 1 kHz. This paper describes status during and improvements thereafter.
Noise of non-astrophysical origin will contaminate science data taken by the Advanced Laser Interferometer Gravitational-wave Observatory (aLIGO) and Virgo gravitational-wave detectors. Prompt characterization instrumental environmental noise transients be critical for improving sensitivity advanced detectors in upcoming runs. During runs initial detectors, were manually classified visually examining time-frequency scan each event. Here, we present three new algorithms designed automatic...
A detection of a core-collapse supernova (CCSN) gravitational-wave (GW) signal with an Advanced LIGO and Virgo detector network may allow us to measure astrophysical parameters the dying massive star. GWs are emitted from deep inside core, and, as such, they direct probes CCSN explosion mechanism. In this study, we show how can determine mechanism GW using combination principal component analysis Bayesian model selection. We use simulations signals exploding via neutrino-driven convection...
The observations of a macronova/kilonova accompanied by gravitational waves from binary neutron star merger (GW170817) confirmed that coalescences produce copious ejecta. coincident gamma-ray detection implies the existence relativistic jet in this system. During jet's propagation within ejecta, high-energy photons and neutrinos can be produced. are absorbed while escape detected. Here, we estimate such transejecta neutrino emission, discuss how could used to differentiate between burst...
The data taken by the advanced LIGO and Virgo gravitational-wave detectors contains short duration noise transients that limit significance of astrophysical detections reduce duty cycle instruments. As are reaching sensitivity levels allow for multiple sources it is crucial to achieve a fast accurate characterization non-astrophysical transient shortly after occurs in detectors. Previously we presented three methods classification sources. They Principal Component Analysis Transients (PCAT),...
We demonstrate the application of a convolutional neural network to gravitational wave signals from core collapse supernovae. Using simulated time series detectors, we show that based on explosion mechanisms, can be used detect and classify buried in noise. For waveforms training network, our results suggest advanced LIGO, VIRGO KAGRA, or LIGO A+, KAGRA is likely magnetorotational supernovae within Large Small Magellanic Clouds, Galactic event if mechanism neutrino-driven mechanism. By...
This work describes the operation of a High Frequency Gravitational Wave detector based on cryogenic Bulk Acoustic (BAW) cavity and reports observation rare events during 153 days over two seperate experimental runs (Run 1 Run 2). In both 2 modes were simultaneously monitored. Across runs, 3rd overtone fast shear mode (3B) operating at 5.506 MHz was monitored, while in second chosen to be 5th OT slow (5C) 8.392 MHz. However, selected closer frequency first mode, (3C) 4.993 Two strong...
This work characterises the sky localization and early warning performance of networks third generation gravitational wave detectors, consisting different combinations detectors with either Einstein Telescope or Cosmic Explorer configuration in sites North America, Europe Australia. Using a Fisher matrix method which includes effect earth rotation, we estimate uncertainty for $1.4\text{M}\odot$-$1.4\text{M}\odot$ binary neutron star mergers at distances $40\text{Mpc}$, $200\text{Mpc}$,...
Presented in this paper is a technique that we propose for extracting the physical parameters of rotating stellar core collapse from observation associated gravitational wave signal and bounce. Data interferometric detectors can be used to provide information on mass progenitor model, precollapse rotation, nuclear equation state. We use waveform libraries provided by latest numerical simulations models general relativity, them create an orthogonal set eigenvectors using principal component...
Stellar collapse and the subsequent development of a core-collapse supernova explosion emit bursts gravitational waves (GWs) that might be detected by advanced generation laser interferometer gravitational-wave observatories such as Advanced LIGO, Virgo, LCGT. GW from supernovae encode information on intricate multidimensional dynamics at work core dying massive star may provide direct evidence for yet uncertain mechanism driving in stars. Recent simulations exploding via neutrino,...
We present a general framework for incorporating astrophysical information into Bayesian parameter estimation techniques used by gravitational wave data analysis to facilitate multi-messenger astronomy. Since the progenitors of transient events, such as compact binary coalescences, are likely be associated with host galaxy, improvements source sky location estimates through use galaxy explored. To demonstrate how properties can included, we simulate population coalescences and show that...
This paper presents the results of observations detectors participating in International Gravitational Event Collaboration (IGEC) from 1997 to 2000 and reviews data analysis methods. The is designed search for coincident excitations multiple detectors. set analyzed this article covers a longer period more complete than that given previous reports. current accurate determining false dismissal probability time coincidence it optimizes with respect target amplitude direction signal. statistics...
We report the initial results from a search for bursts of gravitational radiation by network five cryogenic resonant detectors during 1997 and 1998. This is first significant with more than two observing simultaneously. No wave burst was detected. The false alarm rate lower 1 per 10(4) yr when three or were operating typical threshold H approximately 4x10(-21) Hz-1 on Fourier component at 10(3) Hz strain amplitude. New upper limits amplitude have been set.