G. Modestino
A5072793304- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Dark Matter and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Radio Astronomy Observations and Technology
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Seismic Waves and Analysis
- Statistical and numerical algorithms
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Relativity and Gravitational Theory
- Magnetic confinement fusion research
- Neutrino Physics Research
- Geophysics and Sensor Technology
- Particle physics theoretical and experimental studies
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Cold Atom Physics and Bose-Einstein Condensates
- Physics of Superconductivity and Magnetism
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2007-2024
Istituto Nazionale di Fisica Nucleare
2006-2023
Institute for Physics
2023
Universidad Politécnica de Madrid
2016-2017
University of Rome Tor Vergata
2008
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2008
University of Salerno
1985
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 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...
The passage of cosmic rays has been observed to excite mechanical vibrations in the resonant gravitational wave detector NAUTILUS operating at temperature 100 mK. A very significant correlation (more than 10 standard deviations) is found.
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.
We have developped a procedure for the search of periodic signals in data gravitational wave detectors. report here analysis one year from resonant detector Explorer, searching pulsars located Galactic Center (GC). No with amplitude greater than $\bar{h}= 2.9~10^{-24}$, range 921.32-921.38 Hz, were observed using collected over time period 95.7 days, source at $\alpha=17.70 \pm 0.01$ hours and $\delta=-29.00 0.05$ degrees. Our can be extended any assumed position sky more general all-sky...
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....
The results of a search for short bursts gravitational radiation coincident between the Allegro and Explorer cryogenic resonant mass detectors with strain amplitudes greater than $3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$ are reported data taken from June until December 1991. While no significant excess events was found, an improved upper limit to rate wave incident on Earth has been set.
We report on the present scientific run (04–05) of two detectors EXPLORER and NAUTILUS. The 04–05 started in March 2004. strain sensitivity is about 7 × 10−22 Hz−1/2 bandwidth 5 Hertz. for 1 ms bursts h = 3 10−19.
Data obtained during five months of 2001 with the gravitational wave (GW) detectors EXPLORER and NAUTILUS, operating a bandwidth few Hz at frequencies near 900 Hz, were studied in correlation gamma ray burst data (GRB) BeppoSAX satellite. During this period was only GRB satellite operation, while NAUTILUS GW operation. No between bursts found. The analysis, performed over 47 GRB’s, excludes presence signals amplitude h>~6.5×10−19, 95% probability, if we allow time delay within ±5s,...
Coincidences are searched with the cryogenic resonant gravitational wave detectors EXPLORER and NAUTILUS, during a period of about six months (2 June-14 December 1998) for total measuring time 94.5 days, purpose to study new algorithms analysis, based on physical characteristics detectors.
The International Gravitational Event Collaboration, IGEC, is a coordinated effort by research groups operating gravitational wave detectors working towards the detection of millisecond bursts waves. Here we report on current IGEC resonant bar observatory, its data analysis procedures, main properties first exchanged set. Even though available set not complete, in years 1997 and 1998 up to four were simultaneously. Preliminary results are mentioned.
The statistical association between the output of Gravitational Wave (GW) detectors EXPLORER and NAUTILUS a list Gamma Ray Bursts (GRBs) detected by satellite experiments BATSE BeppoSAX has been analyzed using cumulative algorithms. GW detector data collected 1991 1999 have searched for an energy excess in 10 s interval around GRB flux peak times. analysis relative to large number GRBs (387) allows push upper bound corresponding burst amplitude down...
We present results of the all-sky search for gravitational-wave signals from spinning neutron stars in data EXPLORER resonant bar detector.Our analysis technique was based on maximum likelihood detection method.We briefly describe theoretical methods that we used our search.The main result is an upper limit 2 × 10 -23 dimensionless amplitude continuous coming any direction sky and narrow frequency band 921.00 Hz to 921.76 Hz.
We report here the preliminary results of search for gravitational wave bursts from 2003 run EXPLORER–NAUTILUS experiment. The total common measuring time was 149 days. detectors had a typical noise spectral amplitude about 2 × 10−21 Hz−1/2, bandwidth order 10 Hz and very good stability. derive new upper limit GW burst rate, 0.02 events/day hRSS ⩾ 10−19, discuss implication this result with respect to obtained 2001 run.