Isolation of gravitational waves from displacement noise and utility of a time-delay device

Details Isolation of gravitational waves from displacement noise and utility of a time-delay device Isolation of gravitational waves from displacement noise and utility of a time-delay device

2006-10-25

arxiv.org/abs/gr-qc/0610117v2

J.Phys.Conf.Ser.66:012053,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, 12 figures, a proceeding for the Spanish Relativity Meeting ERE 2006

Scientific paper

10.1088/1742-6596/66/1/012053

Interferometers with kilometer-scale arms have been built for gravitational-wave detections on the ground; ones with much longer arms are being planned for space-based detection. One fundamental motivation for long baseline interferometry is from displacement noise. In general, the longer the arm length L, the larger the motion the gravitational-wave induces on the test masses, until L becomes comparable to the gravitational wavelength. Recently, schemes have been invented, in which displacement noises can be evaded by employing differences between the influence of test-mass motions and that of gravitational waves on light propagation. However, in these schemes, such differences only becomes significant when L approaches the gravitational wavelength, and shot-noise limited sensitivity becomes worse than that of conventional configurations by a factor of at least (f L/c)^(-2), for f

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