G. Cagnoli
A5027293119- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Geophysics and Sensor Technology
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Advanced Frequency and Time Standards
- High-pressure geophysics and materials
- Astrophysics and Cosmic Phenomena
- Seismic Waves and Analysis
- Mechanical and Optical Resonators
- Radio Astronomy Observations and Technology
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Astronomical Observations and Instrumentation
- Acoustic Wave Resonator Technologies
- Statistical and numerical algorithms
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Advanced MEMS and NEMS Technologies
- Advanced Measurement and Metrology Techniques
- Thermoelastic and Magnetoelastic Phenomena
- Advanced Fiber Optic Sensors
- Stellar, planetary, and galactic studies
- Advanced Fiber Laser Technologies
Université Claude Bernard Lyon 1
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Institut Lumière Matière
2016-2025
Laboratoire des Matériaux Avancés
2014-2024
University of Toyama
2023-2024
The University of Tokyo
2023
Institut National de Physique Nucléaire et de Physique des Particules
2015-2023
Teem Photonics (France)
2019-2023
Laboratoire de Physique de l'ENS de Lyon
2022
École Normale Supérieure de Lyon
2021-2022
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.
(Abridged) We describe here the most ambitious survey currently planned in optical, Large Synoptic Survey Telescope (LSST). A vast array of science will be enabled by a single wide-deep-fast sky survey, and LSST have unique capability faint time domain. The design is driven four main themes: probing dark energy matter, taking an inventory Solar System, exploring transient optical sky, mapping Milky Way. wide-field ground-based system sited at Cerro Pach\'{o}n northern Chile. telescope 8.4 m...
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...
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...
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,...
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 GEO 600 laser interferometer with m armlength is part of a worldwide network gravitational wave detectors. Due to the use advanced technologies like multiple pendulum suspensions monolithic last stage and signal recycling, anticipated sensitivity close initial detectors several kilometres armlength. This paper describes subsystems 600, status detector by September 2001 plans towards first science run.
The Virgo detector has now finished its first science run; a mode duty cycle of more than 80% and 4.5 Mpc horizon distance for binary neutron star inspiral sources were achieved. Commissioning breaks organized during the run which permitted improvement sensitivity robustness interferometer against environmental perturbations like bad weather earthquakes. post-run commissioning phase started, with goal preparing next upgrade step detector, Virgo+.
We describe the present state and future evolution of Virgo gravitational wave detector, realized by Collaboration at European Gravitational Observatory, in Cascina near Pisa Italy. summarize basic principles operation design features detector. sensitivity due to a series intermediate upgrades called Virgo+ which is being completed this year includes new monolithic suspensions. scientific potential Finally we discuss plans for second generation Advanced Virgo, introducing its features,...
We present direct upper limits on gravitational wave emission from the Crab pulsar using data first 9 months of fifth science run Laser Interferometer Gravitational-wave Observatory (LIGO). These are based two searches. In we assume that follows observed radio timing, giving an limit beats indirect inferred spin-down and braking index energetics nebula. second allow for a small mismatch between signal frequencies interpret our results in context possible mechanisms.
Data collected by the GEO 600 and LIGO interferometric gravitational wave detectors during their first observational science run were searched for continuous waves from pulsar J1939+2134 at twice its rotation frequency. Two independent analysis methods used are demonstrated in this paper: a frequency domain method time method. Both achieve consistent null results, placing new upper limits on strength of pulsar's emission. A model emission mechanism is to interpret as constraint equatorial...
We present upper limits on the gravitational wave emission from 78 radio pulsars based data third and fourth science runs of LIGO GEO 600 detectors. The both have been combined coherently to maximize sensitivity. For first time, within binary (or multiple) systems included in search by taking into account signal modulation due their orbits. Our are therefore measured for 56 these pulsars. remaining 22, our results improve previous up a factor 10. example, tightest limit strain is...
We analyzed the available LIGO data coincident with GRB 070201, a short-duration, hard-spectrum γ-ray burst (GRB) whose electromagnetically determined sky position is spiral arms of Andromeda galaxy (M31). Possible progenitors such short, hard GRBs include mergers neutron stars or star and black hole, soft repeater (SGR) flares. These events can be accompanied by gravitational-wave emission. No plausible candidates were found within 180 s long window around time 070201. This result implies...
We present a search for gravitational waves from 116 known millisecond and young pulsars using data the fifth science run of LIGO detectors. For this search, ephemerides overlapping period were obtained all radio X-ray observations. demonstrate an updated method that allows small uncertainties in pulsar phase parameters to be included search. report no signal detection any targets therefore interpret our results as upper limits on wave strength. The most interesting are those pulsars....
We carry out two searches for periodic gravitational waves using the most sensitive few hours of data from second LIGO science run. The first search is targeted at isolated, previously unknown neutron stars and covers entire sky in frequency band 160-728.8 Hz. targets accreting star low-mass X-ray binary Scorpius X-1, bands 464-484 Hz 604-624 Hz, orbit parameters. Both look coincidences between Livingston Hanford 4-km interferometers. For isolated our 95% confidence upper limits on wave...
We report on a search for gravitational waves from the coalescence of compact binaries during third and fourth LIGO science runs. The focused generated inspiral phase binary evolution. In our analysis, we considered three categories systems, ordered by mass: (i) primordial black hole with masses in range 0.35 M(sun) < m1, m2 1.0 M(sun), (ii) neutron stars 3.0 (iii) holes M(sun)< m_(max) additional constraint m1+ m_(max), where was set to 40.0 80.0 runs, respectively. Although detectors...
We introduce a novel cooling technique capable of approaching the quantum ground state kilogram-scale system—an interferometric gravitational wave detector. The detectors Laser Interferometer Gravitational-wave Observatory (LIGO) operate within factor 10 standard limit (SQL), providing displacement sensitivity 10−18 m in 100 Hz band centered on 150 Hz. With new feedback strategy, we dynamically shift resonant frequency 2.7 kg pendulum mode to lie this optimal band, where its effective...
We describe the design of suspension systems for major optics Advanced LIGO, upgrade to LIGO—the Laser Interferometric Gravitational-Wave Observatory. The is based on that used in GEO600—the German/UK interferometric gravitational wave detector, with further development meet more stringent noise requirements LIGO. test mass suspensions consist a four-stage or quadruple pendulum enhanced seismic isolation. To minimize thermal noise, final stage consists silica mirror, 40 kg mass, suspended...
We present results from an all-sky search for unmodeled gravitational-wave bursts in the data collected by LIGO, GEO 600 and Virgo detectors between November 2006 October 2007. The is performed three different analysis algorithms over frequency band 50--6000 Hz. Data are analyzed times with at least two of four LIGO-Virgo coincident operation, a total live time 266 days. No events produced survive selection cuts. set frequentist upper limit on rate impinging our network detectors. When...
For the first time, direct detection of gravitational waves occurred in Laser Interferometer Gravitational-wave Observatory (LIGO) interferometers. These advanced detectors require large fused silica mirrors with optical and mechanical properties have never been reached until now. This paper details main achievements these ion beam sputtering coatings.
We present the results of mechanical characterizations many different high-quality optical coatings made ion-beam-sputtered titania-doped tantala and silica, developed originally for interferometric gravitational-wave detectors. Our data show that in multilayer stacks (like high-reflection Bragg mirrors, example) measured coating dissipation is systematically higher than expectation correlated with stress condition sample. This has a particular relevance noise budget current advanced...
Abstract The Advanced Virgo detector has contributed with its data to the rapid growth of number detected GW signals in past few years, alongside two LIGO instruments. First during last month Observation Run 2 (O2) August 2017 (with, most notably, compact binary mergers GW170814 and GW170817), then full 3 (O3): an 11 months taking period, between April 2019 March 2020, that led addition 79 events catalog transient sources maintained by LIGO, now KAGRA. These discoveries manifold exploitation...
We place direct upper limits on the amplitude of gravitational waves from 28 isolated radio pulsars by a coherent multidetector analysis data collected during second science run LIGO interferometric detectors. These are first for 26 pulsars. use coordinated observations time to build radio-guided phase templates expected gravitational-wave signals. The unprecedented sensitivity detectors allows us set strain as low few times 10(-24). translate into equatorial ellipticities pulsars, which...
The Virgo gravitational wave detector is an interferometer with 3 km long arms in construction near Pisa to be commissioned the year 2000. has been designed achieve a strain sensitivity of few times at 200 Hz. A large effort gone into conception mirror suspension system, which expected reduce noise level 10 signals and main sources are briefly discussed; choices made illustrated together present status experiment.