The AURIGA second scientific run and the dual detector of gravitational waves

Abstract We report on the present status of the AURIGA gravitational wave (gw) detector, which is entering its second scientific run: the major changes which it has been subjected to are described along with the expected performance. We also report on a novel kind of acoustic gw detector, named dual detector, which would be broadband; we illustrate the concept of the selective readout, which helps in rejecting thermal and back-action contribution from non-gw sensitive acoustic modes. A SiC dual detector, 2.8 m in diameter and equipped with a wide area selective readout, would reach spectral strain sensitivities below 1×10 −23 Hz −1/2 between 1.3 and 4 kHz .