GW3 - GW Laser Interferometry in Japan and Austral-Asia |
Speaker_ |
Chen, Yanbei |
Co-autors |
Archana Pai, Kentaro Somiya (AEI), Shuichi Sato, Seiji Kawamura (NAOJ), Keiko Kokeyama (Ochanomizu Univ.), Robert Ward (Caltech) |
Talk _ |
Displacement-noise-free Interferometry |
Abstract _ |
Until recently, it was believed that freely-falling test masses are essential for gravitational-wave detection --- with displacement noise directly limiting our sensitivity to the gravitational-wave strain. Here we show that this is not necessarily the case, at least in certain interferometric configurations in which each mirror- endowed test mass is sensed redundantly by multiple light beams. After cancellation of mirror motions using these redundancies, some sensitivity to gravitational waves with non-zero frequencies will survive. We call such technique Displacement-noise Free Interferometry (DFI). |