1,721,989 research outputs found
Gravitational wave detectors: First astrophysical results and path to next generation
No full textAfter several years of construction and commissioning, LIGO, GEO600 and Virgo gravitational waves detectors have reached or exceeded their foreseen sensitivities and have been in operation for a few years. Even if a first detection remains unlikely with these sensitivities, meaningful results from the astrophysical point of view have been obtained on gamma-ray bursts or pulsars for example. For the current joint scientific run of LSC (LIGO Scientific Collaboration) and Virgo collaborations, the "multi-messenger" approach has been reinforced and, in particular, online searches have been implemented in order to trigger external observations by satellites or telescopes.Upgrades to the next generation of these detectors have started. With expected sensitivity increases of a factor 10, we expect GW detections to be frequent and the "multi-messenger" strategy will be fruitful when these next-generation detectors begin data collection in 2015
First Cross-Correlation Analysis of Interferometric and Resonant-Bar Gravitational-Wave Data for Stochastic Backgrounds
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Searching for a stochastic background of gravitational waves with the Laser Interferometer Gravitational-Wave Observatory
No full textThe Laser Interferometer Gravitational-Wave Observatory (LIGO) has performed the fourth science run, S4, with significantly improved interferometer sensitivities with respect to previous runs. Using data acquired during this science run, we place a limit on the amplitude of a stochastic background of gravitational waves. For a frequency independent spectrum, the new Bayesian 90% upper limit is ? GW×H0/72kms-1Mpc-12<6.5×10-5. This is currently the most sensitive result in the frequency range 51150 Hz, with a factor of 13 improvement over the previous LIGO result. We discuss the complementarity of the new result with other constraints on a stochastic background of gravitational waves, and we investigate implications of the new result for different models of this background
Search for gravitational waves from primordial black hole binary coalescences in the galactic halo
No full textWe use data from the second science run of the LIGO gravitational-wave detectors to search for the gravitational waves from primordial black hole binary coalescence with component masses in the range 0.2-1.0M[sun]. The analysis requires a signal to be found in the data from both LIGO observatories, according to a set of coincidence criteria. No inspiral signals were found. Assuming a spherical halo with core radius 5 kpc extending to 50 kpc containing nonspinning black holes with masses in the range 0.2-1.0M[sun], we place an observational upper limit on the rate of primordial black hole coalescence of 63 per year per Milky Way halo (MWH) with 90% confidence
Rapid alerts for following up gravitational wave event candidates
No full textGravitational waves carry unique information about high-energy astrophysical events such as the inspiral and merger of neutron stars and black holes, core collapse in massive stars, and other sources. Large gravitational wave (GW) detectors utilizing exquisitely sensitive laser interferometry - namely, LIGO in the United States and GEO 600 and Virgo in Europe - have been successfully operated in recent years and are currently being upgraded to greatly improve their sensitivities. Many signals are expected to be detected in the coming decade. Simultaneous observing with the network of GW detectors enables us to identify and localize event candidates on the sky with modest precision, opening up the possibility of capturing optical transients or other electromagnetic counterparts to confirm an event and obtain complementary information about it. We developed and implemented the first complete low-latency GW data analysis and alert system in 2009-10 and used it to send alerts to several observing partners; the system design and some lessons learned are briefly described. We discuss several operational considerations and design choices for improving this scientific capability for future observations. © 2012 SPIE
GEO600: status and plans
Full text linkThe GEO600 gravitational wave detector located near Hannover in Germany is one of the four detectors of the LIGO Scientific Collaboration (LSC). For almost the entire year of 2006, GEO600 participated in the S5 science run of the LSC. Overall an equivalent of about 270 days of science data with an average peak sensitivity of better than 3 × 10-22 Hz-1/2 have been acquired so far. In this paper, we describe the status of the GEO600 project during the period between January 2006 and February 2007. In addition, plans for the near-term and medium-term future are discussed
A Gravitational-wave Measurement of the Hubble Constant Following the Second Observing Run of Advanced LIGO and Virgo (vol 908, 218, 2021)
No full textSearches for Gravitational Waves from Compact Binary Coalescences with the LIGO and Virgo Detectors
No full textAmong the most promising sources of gravitational waves for ground-based detectors are the signals emitted during the coalescence of compact binary systems containing neutron stars or black holes. In recent years, the first generation LIGO and Virgo detectors have recorded science data over long observation periods. These data have been analyzed in search of signals from compact binary coalescences - both all-sky searches and searches associated with short gamma-ray bursts have been performed. We review recent results and outline the prospects for future observations
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