Abstract
The basic features of the resonant antennas for the search of gravitational waves are reviewed. These antennas detect the Fourier component H(ω) of the metric tensor perturbation h(t) at the antenna resonance. By means of proper optimum filters, like the Wiener filter, it is possible to reach a sensitivity which is basically limited by the noise of the electronic amplifier. For one cryogenic antenna with mass M=2300 kg and temperature T=20 mK the sensitivity should be of the order of h min ≃ 5 x 10-21. It is shown that the bandwidth of the resonant antennas is much larger than the width of the resonance curve; it can reach values up to 100 Hz if a low noise amplifier is available. Finally the Rome antenna is briefly described. This antenna has a sensitivity of the order of h min ≃ 10-18 and has operated for nine months.
Published Version
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