A5055853592- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Photorefractive and Nonlinear Optics
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Photonic and Optical Devices
- Cosmology and Gravitation Theories
- Advanced Fiber Laser Technologies
- High-pressure geophysics and materials
- Astrophysics and Cosmic Phenomena
- Geophysics and Sensor Technology
- Optical and Acousto-Optic Technologies
- Systemic Lupus Erythematosus Research
- Radio Astronomy Observations and Technology
- Solid State Laser Technologies
- Seismic Waves and Analysis
- Photonic Crystals and Applications
- Atomic and Subatomic Physics Research
- Semiconductor materials and devices
- Ferroelectric and Piezoelectric Materials
- Ion-surface interactions and analysis
- Venous Thromboembolism Diagnosis and Management
- Platelet Disorders and Treatments
- Myeloproliferative Neoplasms: Diagnosis and Treatment
- Luminescence Properties of Advanced Materials
University of Padua
2016-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2006-2024
Osservatorio Astronomico di Padova
2022
National Institute for Subatomic Physics
2019
Ospedale San Giovanni Bosco
1993-2018
University of Turin
1987-2017
National Interuniversity Consortium for the Physical Sciences of Matter
2008-2015
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
2011-2015
Astronomy and Space
2012-2015
Humanitas University
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,...
On August 17, 2017 at 12∶41:04 UTC the Advanced LIGO and Virgo gravitational-wave detectors made their first observation of a binary neutron star inspiral. The signal, GW170817, was detected with combined signal-to-noise ratio 32.4 false-alarm-rate estimate less than one per 8.0×10^{4} years. We infer component masses to be between 0.86 2.26 M_{⊙}, in agreement known stars. Restricting spins range inferred stars, we find 1.17-1.60 total mass system 2.74_{-0.01}^{+0.04}M_{⊙}. source localized...
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...
On 2017 August 17, the gravitational-wave event GW170817 was observed by Advanced LIGO and Virgo detectors, gamma-ray burst (GRB) GRB 170817A independently Fermi Gamma-ray Burst Monitor, Anticoincidence Shield for Spectrometer International Gamma-Ray Astrophysics Laboratory. The probability of near-simultaneous temporal spatial observation occurring chance is $5.0\times 10^{-8}$. We therefore confirm binary neutron star mergers as a progenitor short GRBs. association provides new insight...
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...
On 17 August 2017, the LIGO and Virgo observatories made first direct detection of gravitational waves from coalescence a neutron star binary system. The this gravitational-wave signal, GW170817, offers novel opportunity to directly probe properties matter at extreme conditions found in interior these stars. initial, minimal-assumption analysis data placed constraints on tidal effects coalescing bodies, which were then translated radii. Here, we expand upon previous analyses by working under...
On August 14, 2017 at 10∶30:43 UTC, the Advanced Virgo detector and two LIGO detectors coherently observed a transient gravitational-wave signal produced by coalescence of stellar mass black holes, with false-alarm rate ≲1 in 27 000 years. The was three-detector network matched-filter signal-to-noise ratio 18. inferred masses initial holes are 30.5_{-3.0}^{+5.7}M_{⊙} 25.3_{-4.2}^{+2.8}M_{⊙} (at 90% credible level). luminosity distance source is 540_{-210}^{+130} Mpc, corresponding to...
On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the Advanced LIGO and Virgo detectors. The Fermi Gamma-ray Burst Monitor independently detected gamma-ray burst (GRB 170817A) delay of $\sim$1.7 s respect to time. From gravitational-wave signal, source initially localized sky region 31 deg$^2$ at luminosity distance $40^{+8}_{-8}$ Mpc component masses consistent stars. were later...
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...
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...
On August 17, 2017, the Advanced LIGO and Virgo gravitational-wave detectors observed a low-mass compact binary inspiral. The initial sky localization of source signal, GW170817, allowed electromagnetic observatories to identify NGC 4993 as host galaxy. In this work, we improve estimates binary's properties, including component masses, spins, tidal parameters, using known location, improved modeling, recalibrated data. We extend range frequencies considered down 23 Hz, compared 30 Hz in...
On May 21, 2019 at 03:02:29 UTC Advanced LIGO and Virgo observed a short duration gravitational-wave signal, GW190521, with three-detector network signal-to-noise ratio of 14.7, an estimated false-alarm rate 1 in 4900 yr using search sensitive to generic transients. If GW190521 is from quasicircular binary inspiral, then the detected signal consistent merger two black holes masses 85_{-14}^{+21} M_{⊙} 66_{-18}^{+17} (90% credible intervals). We infer that primary hole mass lies within gap...
The third Gravitational-Wave Transient Catalog (GWTC-3) describes signals detected with Advanced LIGO and Virgo up to the end of their observing run. Updating previous GWTC-2.1, we present candidate gravitational waves from compact binary coalescences during second half run (O3b) between 1 November 2019, 15:00 UTC 27 March 2020, 17:00 UTC. There are 35 coalescence candidates identified by at least one our search algorithms a probability astrophysical origin $p_\mathrm{astro} > 0.5$. Of...
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....
We report on the population of 47 compact binary mergers detected with a false-alarm rate 1/yr in second LIGO--Virgo Gravitational-Wave Transient Catalog, GWTC-2. observe several characteristics merging black hole (BBH) not discernible until now. First, we find that primary mass spectrum contains structure beyond power-law sharp high-mass cut-off; it is more consistent broken power law break at $39.7^{+20.3}_{-9.1}\,M_\odot$, or Gaussian feature peaking $33.1^{+4.0}_{-5.6}\,M_\odot$ (90\%...
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...
We report the observation of gravitational waves from two compact binary coalescences in LIGO's and Virgo's third observing run with properties consistent neutron star-black hole (NSBH) binaries. The events are named GW200105_162426 GW200115_042309, abbreviated as GW200105 GW200115; first was observed by LIGO Livingston Virgo, second all three LIGO-Virgo detectors. source has component masses $8.9^{+1.2}_{-1.5}\,M_\odot$ $1.9^{+0.3}_{-0.2}\,M_\odot$, whereas GW200115...
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.,...