Light dark matter search with AURIGA

We present a search for a new scalar particle, called moduli, performed using the cryogenic resonant-mass gravitational wave detector AURIGA. This particle may give a significant contribution to the Dark Matter (DM) in our Universe. DM clusters under the galaxies gravitational effect, forming the so called galactic halo. The interaction of ordinary matter with a DM halo composed by moduli causes the oscillation of solids with a frequency equal to the mass of the DM particle. In particular, the putative signal would appear as a narrow peak (δf ~ 1 mHz) in the sensitive band of AURIGA, some 100 Hz at about 1 kHz. We used high quality data, selected out of an acquisition of years of continuous running. The search sets upper limits at 95%C.L. on the moduli coupling to matter di ≲ 10-5 around moduli masses mφ = 3.6 · 10-12 eV.