Selective readout and back-action reduction for wideband acoustic gravitational wave detectors

Details Selective readout and back-action reduction for wideband acoustic gravitational wave detectors Selective readout and back-action reduction for wideband acoustic gravitational wave detectors

2003-02-04

arxiv.org/abs/gr-qc/0302012v1

Phys.Rev. D68 (2003) 102004

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, 4 figures

Scientific paper

10.1103/PhysRevD.68.102004

We present the concept of selective readout for broadband resonant mass gravitational wave detectors. This detection scheme is capable of specifically selecting the signal from the contributions of the vibrational modes sensitive to the gravitational waves, and efficiently rejecting the contribution from non gravitationally sensitive modes. Moreover this readout, applied to a dual detector, is capable to give an effective reduction of the back-action noise within the frequency band of interest. The overall effect is a significant enhancement in the predicted sensitivity, evaluated at the standard quantum limit for a dual torus detector. A molybdenum detector, 1 m in diameter and equipped with a wide area selective readout, would reach spectral strain sensitivities 2x10^{-23}/sqrt{Hz} between 2-6 kHz.

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