A5026392771- 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
- Geophysics and Sensor Technology
- Advanced Frequency and Time Standards
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Radio Astronomy Observations and Technology
- Superconducting Materials and Applications
- Neutrino Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Astronomical Observations and Instrumentation
- Statistical and numerical algorithms
- Magnetic confinement fusion research
- Quantum, superfluid, helium dynamics
- Particle physics theoretical and experimental studies
- Superconducting and THz Device Technology
- Dark Matter and Cosmic Phenomena
- Mechanical and Optical Resonators
- Particle accelerators and beam dynamics
- Physics of Superconductivity and Magnetism
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2015-2024
University of Rome Tor Vergata
2015-2024
Gran Sasso Science Institute
2016-2024
Istituto Nazionale di Fisica Nucleare
2004-2022
Institute for Space Astrophysics and Planetology
2022
National Institute for Astrophysics
2022
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2008-2022
Duke University
2022
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2019-2022
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2019-2022
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.
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...
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 describe the cryogenic resonant gravitational wave detector of Rome group, named Explorer, and report on its long term operation with sensitivity for short bursts in range $h\ensuremath{\simeq}7\ensuremath{-}10\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}19}$. Explorer has mass $M=2270$ kg is equipped a capacitive transducer followed by dc superconducting quantum interference device amplifier. It been operated at $T\ensuremath{\simeq}2.6$ K cryostat cooled superfluid helium. With...
The Advanced Virgo interferometer is the upgraded version of detector having goal to extend by a factor 10 observation horizon in universe and consequently increase detection rate three orders magnitude. Its installation progress expected be completed late 2015. In this proceeding we will present scheme main challenging technical features give an outline status foreseen time schedule which bring its full operation.
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.
The Virgo detector is a kilometer-length interferometer for gravitational wave detection located near Pisa (Italy). During its second science run (VSR2) in 2009, 6 months of data were accumulated with sensitivity close to design. In this paper, the methods used determine parameters estimation and reconstruction are described. main quantities be calibrated frequency response mirror actuation sensing output power. Focus also put on their absolute timing. monitoring calibration parameter...
On date 9 th of October 2022, an exceptionally bright Gamma-Ray Burst, GRB 221009A, was detected by several observatories, both ground- and space-based. It has been the highest flux Burst ever observed, with energy E iso ∼ 10 55 erg, its detection followed many studies. In our work, we model very high (E> 100 GeV) afterglow light curve published LHAASO Collaboration using a numerical modelling analytical approach to constrain free parameter space. The in (0.3 - 5) TeV range, as LHAASO,...
We report on the first cryogenic test at ultralow temperature of new gravitational-wave antenna "Nautilus" Rome group. The 2390 kg Al 5056 cylindrical-bar has been cooled to a 95 mK.
The network of resonant bar detectors gravitational waves resumed coordinated observations within the International Gravitational Event Collaboration (IGEC-2). Four are taking part in this Collaboration: ALLEGRO, AURIGA, EXPLORER and NAUTILUS. We present here results search for wave bursts over 6 months during 2005, when IGEC-2 was only observatory operation. implemented data analysis is based on a time coincidence among NAUTILUS; ALLEGRO reserved follow-up studies. amplitude sensitivity to...
Thermal effects in the test masses of gravitational waves interferometric detectors may result a strong limitation to their operation and sensitivity. Already initial LIGO Virgo, these have been observed required installation dedicated compensation systems. Based on CO2 laser projectors, thermal compensators heat peripheral input reduce lensing effect. In advanced detectors, power circulating interferometer will increase, thus making more relevant. this paper, concept system for Advanced...
The most important features of the proposed spherical gravitational wave detectors are closely linked with their symmetry. Hollow spheres share this property solid ones, considered in literature so far, and constitute an interesting alternative for realization omnidirectional detector. In paper we address problem how a hollow elastic sphere interacts incoming find analytical solution its normal mode spectrum response, as well energy absorption cross sections. It appears that shape can be...
We review the main features and perspectives of resonant-mass gravitational wave detectors.Bar detectors have been taking data for last few years with burst sensitivity h 4 × 10 -19 at SNR = 1, or, in spectral units, 3 -22 Hz -1/2 over a bandwidth about 1 Hz, duty cycle mainly limited by cryogenic operations.In addition to systematic search impulsive events, collected are being used detect periodic waves long time periods, give new upper limits stochastic background cosmological origin,...
We present the performances and strain sensitivity of first spherical gravitational wave detector equipped with a capacitive transducer readout by low noise two-stage SQUID amplifier operated at temperature 5 K. characterized performance in terms thermal electrical system output signal. measured peak $1.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}20}\text{ }\text{ }{\mathrm{Hz}}^{\ensuremath{-}1/2}$ 2942.9 Hz. A better than...
We consider the possibility of discriminating different theories gravity using a recently proposed gravitational wave detector spherical shape. argue that spin content can be extracted relating measurements excited spheroidal vibrational eigenmodes to Newman-Penrose parameters. The sphere toroidal modes cannot by any metric GW and thus used as veto.
We discuss the science motivations and prospects for a joint analysis of gravitational wave (GW) low-energy neutrino data to search prompt signals from nearby supernovae (SNe). Both neutrinos are expected be produced in innermost region core-collapse supernova, coincident would probe processes which power supernova explosion. It is estimated that current generation detectors sensitive galactic supernovae, also able detect electromagnetically dark SNe. A GW-neutrino enable improvements...
The Virgo experiment, located near Pisa, Italy, is a large laser Michelson interferometer aiming at the first direct detection of gravitational waves. monitors relative distance its mirrors placed ends two 3 km-long perpendicular arms. goal to measure spectral differential variations arm lengths 10 −18 m/Hz 1/2 in frequency range from Hz kHz. Avoiding spurious motions optical components therefore essential detect Since ground motion 9 orders magnitude larger than length induced by waves,...
Resonant gravitational wave detectors with an observation bandwidth of tens hertz are a reality: the antenna Explorer, operated at CERN by ROG Collaboration, has been upgraded new readout. In this configuration, it exhibits unprecedented useful bandwidth: in over 55 Hz about its center operating frequency 919 spectral sensitivity is better than 10(-20) Hz(-1/2). We describe detector and discuss foreseeable upgrades to even larger bandwidths.
We report the result from a search for bursts of gravitational waves using data collected by cryogenic resonant detectors EXPLORER and NAUTILUS during year 2001, total measuring time 90 days. With these we repeated coincidence performed on 1998 (which showed small excess) applying analysis algorithms based known physical characteristics detectors. 2001 new interesting excess is found when are favorably oriented with respect to Galactic Disk.
Virgo is designed to detect gravitational waves of both astrophysical and cosmological origin in the frequency range from a few Hz kHz. After end first science run, partially overlapped with LIGO fifth detector underwent several upgrades improve its sensitivity. The second run started at beginning July 2009 coincidence LIGO. A further upgrade planned 2010 installation new suspensions for test masses mirrors. This will lead considerable improvement sensitivity represents an intermediate step...
We present here the results of a 515 day search for short bursts gravitational waves by IGEC2 observatory. This network included 4 cryogenic resonant-bar detectors: AURIGA, EXPLORER, and NAUTILUS in Europe, ALLEGRO America. These cover time period from November 6th 2005 until April 15th 2007, partly overlapping first long term observations LIGO interferometric detectors. The observatory operated with high duty cycle, namely, 57% fourfold coincident observations, 94% threefold observations....