Coherent interaction of a monochromatic gravitational wave with both elastic bodies and electromagnetic circuits - art. no. 024001.

The interaction of a gravitational wave with a system made of an RLC circui t forming one end of a mechanical harmonic oscillator is investigated. We s how that, in some configurations, the coherent interaction of the wave with both the mechanical oscillator and the RLC circuit gives rise to a mechani cal quality factor increase of the electromagnetic signal. When this system is used as an amplifier of gravitational periodic signals in the frequency range 50-1000 Hz, at ultracryogenic temperatures and for sufficiently long integration times (up to 4 months), a sensitivity of 10(-24)-10(-27) On th e amplitude of the metric could be achieved when thermal noise, shot noise, and amplifier back action are considered. [S0556-2821(98)03522-X].