Resonant-Mass Gravitational Wave Detectors at the Beginning of the New Millennium

Mathematics – Logic

Scientific paper

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Scientific paper

Direct detection of gravitational waves is one of the great challenges of contemporary experimental physics. We report on the status of the five resonant-mass detectors of gravitational waves operating today in Australia, Italy and USA. These bar detectors are in the continuous observational mode with burst sensitivity h≃ 4 × 10-19, or, in spectral units, 3 × 10-22 Hz-1/2 over bandwidth of about 1 Hz, with a duty cycle mainly limited by cryogenic operations. The strongest potential sources of GW bursts in our Galaxy and in the local group are today monitored by such instruments. In addition to the sistematic search for impulsive events, the data collected are being used to detect periodic waves over long time periods, for giving new upper limits for the stochastic background of cosmological origin, and for studying possible correlation with gamma ray bursts. We report here the status of the art of such detectors and their future prospects.

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