M. Branchesi
A5053327958- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Geophysics and Sensor Technology
- Stellar, planetary, and galactic studies
- High-pressure geophysics and materials
- Galaxies: Formation, Evolution, Phenomena
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Seismic Waves and Analysis
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Statistical and numerical algorithms
- Magnetic confinement fusion research
- Black Holes and Theoretical Physics
- Particle Accelerators and Free-Electron Lasers
- Cold Atom Physics and Bose-Einstein Condensates
- Particle Detector Development and Performance
- Superconducting Materials and Applications
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2017-2024
Gran Sasso Science Institute
2017-2024
Istituto Nazionale di Fisica Nucleare
2018-2024
Collurania Teramo Observatory
2020-2023
University of Urbino
2011-2021
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2011-2021
National Institute for Subatomic Physics
2019
University of Rome Tor Vergata
2018
Campbell Collaboration
2015-2018
University of Nova Gorica
2018
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.
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...
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.
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,...
In this paper, we study the formation and dynamical evolution of black hole–black hole (BH–BH) binaries in young star clusters (YSCs), by means N-body simulations. The simulations include metallicity-dependent recipes for stellar winds, have been run three different metallicities (Z = 0.01, 0.1 1 Z⊙). Following recent theoretical models wind mass-loss core-collapse supernovae, assume that mass remnants depends on metallicity progenitor stars. We find BH–BH form efficiently because exchanges:...
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 report on a search for gravitational waves from coalescing compact binaries using LIGO and Virgo observations between July 7, 2009 October 20, 2010. searched signals with total mass 2 25 solar masses; this includes binary neutron stars, black holes, consisting of hole star. The detectors were sensitive to systems up 40 Mpc distant further higher systems. No gravitational-wave detected. upper limits the rate coalescence as function mass, including results previous observations. cumulative...
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...
We report our observation of the short gamma-ray burst (GRB) GRB 170817A, associated to binary neutron star merger gravitational wave (GW) event GW 170817, performed in X-ray band with XMM-Newton 135 d after (on 29 December, 2017). find evidence for a flattening light curve respect previously observed brightening. This is also supported by nearly simultaneous optical Hubble Space Telescope and successive Chandra low-frequency radio observations recently reported literature. Since...
The binary neutron star merger event GW170817 was detected through both electromagnetic radiation and gravitational waves. Its afterglow emission may have been produced by either a narrow relativistic jet or an isotropic outflow. High-spatial-resolution measurements of the source size displacement can discriminate between these scenarios. We present very-long-baseline interferometry observations, performed 207.4 days after using global network 32 radio telescopes. apparent is constrained to...
Abstract The Lunar Gravitational-wave Antenna (LGWA) is a proposed array of next-generation inertial sensors to monitor the response Moon gravitational waves (GWs). Given size and expected noise produced by lunar seismic background, LGWA would be able observe GWs from about 1 mHz Hz. This make missing link between space-borne detectors like LISA with peak sensitivities around few millihertz future terrestrial Einstein Telescope or Cosmic Explorer. In this article, we provide first...
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 the results of searches for gravitational waves from a large selection pulsars using data most recent science runs (S6, VSR2 and VSR4) initial generation interferometric wave detectors LIGO (Laser Interferometric Gravitational-wave Observatory) Virgo. do not see evidence emission any targeted sources but produce upper limits on amplitude. highlight seven young with spin-down luminosities. reach within factor five canonical limit all these, whilst Crab Vela we further surpass their...
We present results from a search for gravitational-wave bursts in the data collected by LIGO and Virgo detectors between July 7, 2009 October 20, 2010: are analyzed when at least two of three LIGO-Virgo coincident operation, with total observation time 207 days. The analysis searches transients duration < 1 s over frequency band 64-5000 Hz, without other assumptions on signal waveform, polarization, direction or occurrence time. All identified events consistent expected accidental...
Compact binary systems with neutron stars or black holes are one of the most promising sources for ground-based gravitational wave detectors. Gravitational radiation encodes rich information about source physics; thus parameter estimation and model selection crucial analysis steps any detection candidate events. Detailed models anticipated waveforms enable inference on several parameters, such as component masses, spins, sky location distance that essential new astrophysical studies these...
Short gamma-ray bursts (SGRBs) observed by Swift potentially reveal the first insight into cataclysmic compact object mergers. To ultimately acquire a fundamental understanding of these events requires pan-spectral observations and knowledge their spatial distribution to differentiate between proposed progenitor populations. Up 2012 April, there are only some 30 per cent SGRBs with reasonably firm redshifts, this sample is highly biased limited sensitivity detect SGRBs. We account for...
Gravitational waves from a variety of sources are predicted to superpose create stochastic background. This background is expected contain unique information throughout the history universe that unavailable through standard electromagnetic observations, making its study fundamental importance understanding evolution universe. We carry out search for with latest data LIGO and Virgo. Consistent predictions most gravitational-wave models, display no evidence signal. Assuming spectrum...
We present the results of a search for gravitational waves associated with 154 gamma-ray bursts (GRBs) that were detected by satellite-based experiments in 2009–2010, during sixth LIGO science run and second third Virgo runs. perform two distinct searches: modeled coalescences either neutron stars or star black hole, generic, unmodeled gravitational-wave bursts. find no evidence counterparts, any individual GRB this sample population as whole. For all GRBs we place lower bounds on distance...
We report a search for gravitational waves from the inspiral, merger and ringdown of binary black holes (BBH) with total mass between 25 100 solar masses, in data taken at LIGO Virgo observatories July 7, 2009 October 20, 2010. The maximum sensitive distance detectors over this period $(20,20){\mathrm{M}}_{\ensuremath{\bigodot}}$ coalescence was 300 Mpc. No wave signals were found. thus upper limits on astrophysical rates BBH as function component masses nonspinning components, also evaluate...