M. A. Bizouard
A5025172623- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Particle physics theoretical and experimental studies
- Astrophysical Phenomena and Observations
- Geophysics and Sensor Technology
- High-Energy Particle Collisions Research
- Cosmology and Gravitation Theories
- Advanced Frequency and Time Standards
- Quantum Chromodynamics and Particle Interactions
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Astronomical Observations and Instrumentation
- Cold Atom Physics and Bose-Einstein Condensates
- Statistical and numerical algorithms
- Computational Physics and Python Applications
- Advanced Measurement and Metrology Techniques
- Magnetic confinement fusion research
- Black Holes and Theoretical Physics
- Seismology and Earthquake Studies
- Superconducting Materials and Applications
Observatoire de la Côte d’Azur
2019-2025
Centre National de la Recherche Scientifique
2015-2024
Université Côte d'Azur
2019-2024
Groupe Artémis (France)
2022
Université Paris-Sud
2012-2021
Institut National de Physique Nucléaire et de Physique des Particules
2010-2021
GANIL
2005-2021
Université Paris-Saclay
2008-2021
Goddard Space Flight Center
2014
ESPCI Paris
2010-2012
On September 14, 2015 at 09:50:45 UTC the two detectors of Laser Interferometer Gravitational-Wave Observatory simultaneously observed a transient gravitational-wave signal. The signal sweeps upwards in frequency from 35 to 250 Hz with peak strain 1.0×10(-21). It matches waveform predicted by general relativity for inspiral and merger pair black holes ringdown resulting single hole. was matched-filter signal-to-noise ratio 24 false alarm rate estimated be less than 1 event per 203,000 years,...
Advanced Virgo is the project to upgrade interferometric detector of gravitational waves, with aim increasing number observable galaxies (and thus detection rate) by three orders magnitude. The now in an advanced construction phase and assembly integration will be completed end 2015. part a network, alongside two LIGO detectors US GEO HF Germany, goal contributing early waves opening new window observation on universe. In this paper we describe main features outline status construction.
We report the observation of a gravitational-wave signal produced by coalescence two stellar-mass black holes. The signal, GW151226, was observed twin detectors Laser Interferometer Gravitational-Wave Observatory (LIGO) on December 26, 2015 at 03:38:53 UTC. initially identified within 70 s an online matched-filter search targeting binary coalescences. Subsequent off-line analyses recovered GW151226 with network signal-to-noise ratio 13 and significance greater than 5 $\sigma$. persisted in...
We present the results from three gravitational-wave searches for coalescing compact binaries with component masses above <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>1</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:msub><a:mrow><a:mi>M</a:mi></a:mrow><a:mrow><a:mo stretchy="false">⊙</a:mo></a:mrow></a:msub></a:mrow></a:math> during first and second observing runs of advanced detector network. During run (<d:math...
We describe the observation of GW170104, a gravitational-wave signal produced by coalescence pair stellar-mass black holes. The was measured on January 4, 2017 at 10∶11:58.6 UTC twin advanced detectors Laser Interferometer Gravitational-Wave Observatory during their second observing run, with network signal-to-noise ratio 13 and false alarm rate less than 1 in 70 000 years. inferred component hole masses are 31.2_{-6.0}^{+8.4}M_{⊙} 19.4_{-5.9}^{+5.3}M_{⊙} (at 90% credible level). spins best...
The LIGO detection of GW150914 provides an unprecedented opportunity to study the two-body motion a compact-object binary in large-velocity, highly nonlinear regime, and witness final merger excitation uniquely relativistic modes gravitational field. We carry out several investigations determine whether is consistent with black-hole general relativity. find that remnant's mass spin, as determined from low-frequency (inspiral) high-frequency (postinspiral) phases signal, are mutually solution...
In 2009-2010, the Laser Interferometer Gravitational-wave Observa- tory (LIGO) operated together with international partners Virgo and GEO600 as a network to search for gravitational waves of astrophysical origin. The sensitiv- ity these detectors was limited by combination noise sources inherent instrumental design its environment, often localized in time or frequency, that couple into gravitational-wave readout. Here we review performance LIGO instruments during this epoch, work done...
On June 8, 2017 at 02:01:16.49 UTC, a gravitational-wave signal from the merger of two stellar-mass black holes was observed by Advanced LIGO detectors with network signal-to-noise ratio 13. This system is lightest hole binary so far observed, component masses $12^{+7}_{-2}\,M_\odot$ and $7^{+2}_{-2}\,M_\odot$ (90% credible intervals). These lie in range measured low-mass X-ray binaries, thus allowing us to compare detected through gravitational waves electromagnetic observations. The...
We present an up-to-date, comprehensive summary of the rates for all types compact binary coalescence sources detectable by Initial and Advanced versions ground-based gravitational-wave detectors LIGO Virgo. Astrophysical estimates compact-binary depend on a number assumptions unknown model parameters, are still uncertain. The most confident among these rate predictions coalescing neutron stars which based extrapolations from observed pulsars in our Galaxy. These yield likely 100 per Myr...
The Einstein Telescope (ET), a proposed European ground-based gravitational-wave detector of third-generation, is an evolution second-generation detectors such as Advanced LIGO, Virgo, and KAGRA which could be operating in the mid 2030s. ET will explore universe with gravitational waves up to cosmological distances. We discuss its main scientific objectives potential for discoveries astrophysics, cosmology fundamental physics.
On September 14, 2015, the Laser Interferometer Gravitational-Wave Observatory (LIGO) detected a gravitational-wave transient (GW150914); we characterize properties of source and its parameters. The data around time event were analyzed coherently across LIGO network using suite accurate waveform models that describe gravitational waves from compact binary system in general relativity. GW150914 was produced by nearly equal mass black hole masses 36_{-4}^{+5}M_{⊙} 29_{-4}^{+4}M_{⊙}; for each...
The first observational run of the Advanced LIGO detectors, from September 12, 2015 to January 19, 2016, saw detections gravitational waves binary black hole mergers. In this paper we present full results a search for merger signals with total masses up $100 M_\odot$ and detailed implications our observations these systems. Our search, based on general-relativistic models wave systems, unambiguously identified two signals, GW150914 GW151226, significance greater than $5\sigma$ over observing...
We present results on the mass, spin, and redshift distributions with phenomenological population models using ten binary black hole mergers detected in first second observing runs completed by Advanced LIGO Virgo. constrain properties of (BBH) mass spectrum a range parameterizations BBH spin distributions. find that distribution more massive such binaries is well approximated no than 1% holes $45\,M_\odot$, power law index $\alpha = {1.3}^{+1.4}_{-1.7}$ (90% credibility). also show BBHs are...
The discovery of the gravitational-wave source GW150914 with Advanced LIGO detectors provides first observational evidence for existence binary black-hole systems that inspiral and merge within age Universe. Such mergers have been predicted in two main types formation models, involving isolated binaries galactic fields or dynamical interactions young old dense stellar environments. measured masses robustly demonstrate relatively "heavy" black holes ($\gtrsim 25\, M_\odot$) can form nature....
The detection of gravitational waves by Advanced LIGO and Virgo provides an opportunity to test general relativity in a regime that is inaccessible traditional astronomical observations laboratory tests. We present four tests the consistency data with binary black hole waveforms predicted relativity. One subtracts best-fit waveform from checks residual detector noise. second low- high-frequency parts observed signals. third phenomenological deviations introduced model (including...
Following a major upgrade, the two advanced detectors of Laser Interferometer Gravitational-wave Observatory (LIGO) held their first observation run between September 2015 and January 2016. With strain sensitivity 10^{-23}/sqrt[Hz] at 100 Hz, product observable volume measurement time exceeded that all previous runs within 16 days coincident observation. On 14, 2015, Advanced LIGO observed transient gravitational-wave signal determined to be coalescence black holes [B. P. Abbott et al.,...
On September 14, 2015 at 09:50:45 UTC the two detectors of Laser Interferometer Gravitational-wave Observatory (LIGO) simultaneously observed binary black hole merger GW150914. We report results a matched-filter search using relativistic models compact-object binaries that recovered GW150914 as most significant event during coincident observations between LIGO from 12 to October 20, 2015. was with matched filter signal-to-noise ratio 24 and false alarm rate estimated be less than 1 per...
The LIGO detection of the gravitational wave transient GW150914, from inspiral and merger two black holes with masses ≳30M⊙, suggests a population binary relatively high mass. This observation implies that stochastic gravitational-wave background holes, created incoherent superposition all merging binaries in Universe, could be higher than previously expected. Using properties we estimate energy density such holes. In most sensitive part Advanced Virgo band for backgrounds (near 25 Hz),...
Current interferometric gravitational-wave detectors are limited by quantum noise over a wide range of their measurement bandwidth. One method to overcome the limit is injection squeezed vacuum states light into interferometer's dark port. Here, we report on successful application this technology improve shot sensitivity Advanced Virgo detector. A enhancement up 3.2±0.1 dB beyond achieved. This nonclassical improvement corresponds 5%–8% increase binary neutron star horizon. The squeezing was...
On 14 September 2015, a gravitational wave signal from coalescing black hole binary system was observed by the Advanced LIGO detectors. This paper describes transient noise backgrounds used to determine significance of event (designated GW150914) and presents results investigations into potential correlated or uncorrelated sources in detectors around time event. The were operating nominally at GW150914. We have ruled out environmental influences non-Gaussian instrument either detector as...
This paper presents a complete description of Virgo, the French-Italian gravitational wave detector. The detector, built at Cascina, near Pisa (Italy), is very large Michelson interferometer, with 3 km-long arms. In this paper, following presentation physics requirements, leading to specifications for construction detailed all its different elements given. These include civil engineering infrastructures, huge ultra-high vacuum (UHV) chamber (about 6000 cubic metres), optical components,...