A. Taracchini
A5107974897- 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
- Seismic Waves and Analysis
- Geophysics and Sensor Technology
- Statistical and numerical algorithms
- High-pressure geophysics and materials
- Radio Astronomy Observations and Technology
- Advanced Radiotherapy Techniques
- Advanced Frequency and Time Standards
- Radiation Therapy and Dosimetry
- Astronomical Observations and Instrumentation
- Atomic and Subatomic Physics Research
- Computational Physics and Python Applications
- Medical Imaging Techniques and Applications
- Seismology and Earthquake Studies
- Cold Atom Physics and Bose-Einstein Condensates
- earthquake and tectonic studies
- Advanced X-ray and CT Imaging
- Seismic Imaging and Inversion Techniques
- Neutrino Physics Research
- Black Holes and Theoretical Physics
Shanghai Ninth People's Hospital
2025
Shanghai Jiao Tong University
2025
Chinese Academy of Medical Sciences & Peking Union Medical College
2025
National Clinical Research
2025
Max Planck Institute for Gravitational Physics
2016-2021
University of Maryland, College Park
2015-2021
Max Planck Society
2016
Dana-Farber Brigham Cancer Center
2006-2009
Dana-Farber Cancer Institute
2009
Women's Hospital
2009
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 report on a search for gravitational waves from coalescing compact binary systems in the Milky Way and Magellanic Clouds. The analysis uses data taken by two of three LIGO interferometers during first science run illustrates method setting upper limits inspiral event rates using interferometer data. pipeline is described with particular attention to selection coincidence between interferometers. establish an observational limit R<1.7×102 per year Equivalent Galaxy (MWEG), 90% confidence,...
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 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 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 Laser Interferometer Gravitational-wave Observatory (LIGO) has performed the fourth science run, S4, with significantly improved interferometer sensitivities respect to previous runs. Using data acquired during this we place a limit on amplitude of stochastic background gravitational waves. For frequency independent spectrum, new is $Ω_{\rm GW} < 6.5 \times 10^{-5}$. This currently most sensitive result in range 51-150 Hz, factor 13 improvement over LIGO result. We discuss...
We report on an all-sky search with the LIGO detectors for periodic gravitational waves in frequency range 50--1000 Hz and frequency's time derivative $\ensuremath{-}1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}\text{ }\text{ }\mathrm{Hz}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$ to zero. Data from fourth science run (S4) have been used this search. Three different semicoherent methods of transforming summing strain power short Fourier transforms (SFTs) calibrated data used. The...
We use 373 hours ($\ensuremath{\approx}15$ days) of data from the second science run LIGO gravitational-wave detectors to search for signals binary neutron star coalescences within a maximum distance about 1.5 Mpc, volume space which includes Andromeda Galaxy and other galaxies Local Group galaxies. This analysis requires signal be found in at two sites, according set coincidence criteria. The background (accidental rate) is determined used judge significance event candidates. No inspiral...
We report on a search for gravitational wave bursts using data from the first science run of Laser Interferometer Gravitational Wave Observatory (LIGO) detectors. Our focuses with durations ranging 4 to 100 ms, and significant power in LIGO sensitivity band 150 3000 Hz. bound rate such detected at less than 1.6 events per day 90% confidence level. This result is interpreted terms detection efficiency ad hoc waveforms (Gaussians sine Gaussians) as function their root-sum-square strain hrss;...
We searched for an anisotropic background of gravitational waves usingdata from the LIGO S4 science run and a method that is optimizedfor point sources. This appropriate if, example, gravitationalwave dominated by small number distinct astrophysical sources.No signal was seen. Upper limit maps were produced assuming two differentpower laws source strain power spectrum. For ${f}^{\ensuremath{-}3}$ law using the50 Hz to 1.8 kHz band upper limits on sourcestrain spectrum vary between...
We present the analysis of between 50 and 100 h coincident interferometric strain data used to search for establish an upper limit on a stochastic background gravitational radiation. These come from first LIGO science run, during which all three interferometers were operated over 2-week period spanning August September 2002. The method cross correlating outputs two is analysis. describe in detail practical signal processing issues that arise when working with real data, we observational...
The Laser Interferometer Gravitational-Wave Observatory has performed a third science run with much improved sensitivities of all three interferometers. We present an analysis approximately 200 hours data acquired during this run, used to search for stochastic background gravitational radiation. place upper bounds on the energy density stored as radiation different spectral power laws. For flat spectrum, our limit Ω0<8.4×10−4 in 69–156 Hz band is ∼105 times lower than previous result...
We report on a search for gravitational waves from binary black hole inspirals in the data second science run of LIGO interferometers. The focused systems with component masses between 3 and $20{M}_{\ensuremath{\bigodot}}$. Optimally oriented binaries distances up to 1 Mpc could be detected efficiency at least 90%. found no events that identified as 385.6 hours we searched.
The fourth science run of the LIGO and GEO 600 gravitational-wave detectors, carried out in early 2005, collected data with significantly lower noise than previous runs. We report on a search for short-duration bursts arbitrary waveform 64–1600 Hz frequency range appearing all three interferometers. Signal consistency tests, quality cuts auxiliary-channel vetoes are applied to reduce rate spurious triggers. No signals detected 15.5 days live observation time; we set frequentist upper limit...
We use data from the second science run of LIGO gravitational-wave detectors to search for gravitational waves primordial black hole binary coalescence with component masses in range $0.2--1.0{M}_{\ensuremath{\bigodot}}$. The analysis requires a signal be found both observatories, according set coincidence criteria. No inspiral signals were found. Assuming spherical halo core radius 5 kpc extending 50 containing nonspinning holes $0.2--1.0{M}_{\ensuremath{\bigodot}}$, we place an...
We present the results of a search for short-duration gravitational-wave bursts associated with 39 gamma-ray (GRBs) detected by satellite experiments during LIGO's S2, S3, and S4 science runs. The involves calculating crosscorrelation between two interferometer data streams surrounding GRB trigger time. gravitational radiation from single GRBs, also apply statistical tests to signature whole sample. For sample examined, we find no evidence association either on single-GRB basis or basis....
We perform a wide parameter space search for continuous gravitational waves over the whole sky and large range of values frequency first spin-down parameter. Our method is based on Hough transform, which semi-coherent, computationally efficient, robust pattern recognition technique. apply this technique to data from second science run LIGO detectors our final results are all-sky upper limits strength emitted by unknown isolated spinning neutron stars set narrow bands in 200-$400 $Hz. The...
We have performed a search for bursts of gravitational waves associated with the very bright Gamma Ray Burst GRB030329, using two detectors at LIGO Hanford Observatory. Our covered most sensitive frequency range (approximately 80-2048 Hz), and we specifically targeted signals shorter than 150 ms. algorithm looks excess correlated power between interferometers thus makes minimal assumptions about waveform. observed no candidates wave signal strength larger pre-determined threshold. report...
We have searched for gravitational waves (GWs) associated with the SGR $1806\ensuremath{-}20$ hyperflare of 27 December 2004. This event, originating from a Galactic neutron star, displayed exceptional energetics. Recent investigations x-ray light curve's pulsating tail revealed presence quasiperiodic oscillations (QPOs) in 30--2000 Hz frequency range, most which coincides bandwidth LIGO detectors. These QPOs, well-characterized frequencies, can plausibly be attributed to seismic modes star...
Dental restorations, fixed prosthodontics, and implants affect dose distribution in head neck radiation therapy due to the high atomic number of materials utilized. The backscatter electrons from metallic impinging treatment x-ray results localized enhancements. These enhancements cause mucositis patients who have dental work, a significant clinical complication. We investigated effect 23 configurations work using EGS4nrc Monte Carlo (MC) simulation system. found that all-metal partial...
We perform a search for gravitational wave bursts using data from the second science run of LIGO detectors, method based on wavelet time-frequency decomposition. This is sensitive to duration much less than and with frequency content in 100--1100 Hz range. It features significant improvements instrument sensitivity analysis pipeline respect burst previously reported by LIGO. Improvements allow exploring weaker signals, relative detector noise floor, while maintaining low false alarm rate,...
We report on the first joint search for gravitational waves by TAMA and LIGO collaborations. looked millisecond-duration unmodelled gravitational-wave bursts in 473 hr of coincident data collected during early 2003. No candidate signals were found. set an upper limit 0.12 events per day rate detectable bursts, at 90% confidence level. From simulations, we estimate that our detector network was sensitive to with root-sum-square strain amplitude above approximately 1-3x10^{-19} Hz^{-1/2}...
Data from the LIGO Livingston interferometer and ALLEGRO resonant-bar detector, taken during LIGO’s fourth science run, were examined for cross correlations indicative of a stochastic gravitational-wave background in frequency range 850–950 Hz, with most sensitivity arising between 905 925 Hz. was operated three different orientations experiment to modulate relative sign environmental correlations. No statistically significant seen any orientations, results used set Bayesian 90% confidence...