A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2021; you can also visit the original URL.
The file type is
We study a cross-shaped cavity filled with superfluid ^4He as a prototype resonant-mass gravitational wave detector. Using a membrane and a re-entrant microwave cavity as a sensitive optomechanical transducer, we were able to observe the thermally excited high-Q acoustic modes of the helium at 20 mK temperature and achieved a strain sensitivity of 8 × 10^-19 Hz^-1/2 to gravitational waves. To facilitate the broadband detection of continuous gravitational waves, we tune the kilohertz-scalearXiv:2107.00120v1 fatcat:vnvjrfpqkrbjhgvk5r5upfcvmq