112,657 research outputs found
Resonant-mass detectors: status and perspectives
No full textWe review the main features and the perspectives of the resonant-mass gravitational wave detectors. Bar detectors have been taking data for the last few years with burst sensitivity h sime 4 × 10−19 at SNR = 1, or, in spectral units, 3 × 10−22 Hz −1/2 over a bandwidth of about 1 Hz, with a duty cycle mainly limited by cryogenic operations. In addition to the systematic search for impulsive events, the data collected are being used to detect periodic waves over long time periods, to give new upper limits for the stochastic background of cosmological origin, and to study possible correlation with gamma ray bursts. The recent developments of readout electronics have allowed us to increase the detection bandwidth to a few tens of Hz, and even larger bandwidths are expected in the near future. Resonant-mass detectors of spherical shape have been investigated and many different solutions have been proposed. Two small (about 60 cm in diameter) spheres are under construction in Holland and Brazil. Recently, a new scheme has been proposed, the 'dual' detector, which can provide a wideband performance. We briefly describe the status of traditional resonant-mass detectors and the main features and the state of the art of the advanced acoustic detectors
Developments in resonant-mass detectors
No full textAbstract After a brief summary of the state of the art of resonant-mass detectors, we will describe the planned developments of bar antennas and the near-term perspectives related to the development of SFERA, a new, 33 ton, spherical detector
SFERA: The new spherical gravitational wave detector
No full textThis paper describes the main properties of gravitational wave detectors of spherical shape, the experimental achievements obtained up to now towards the development of this kind of detectors and the expected sensitivity of SFERA, a 2 meters diameter spherical antenna proposed as the next step in the development of resonant gravitational wave detectors
Gravitational wave radiation from compact binary systems in the Jordan-Brans-Dicke theory
No full textIn this paper we analyze the signal emitted by a compact binary system in the Jordan-Brans-Dicke theory. We compute the scalar and tensor components of the power radiated by the source and study the scalar waveform. Eventually we consider the detectability of the scalar component of the radiation by interferometers and resonant-mass detectors
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