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

Abstract

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.

9 pages, 4 figures

References in corpus (6)

• Second generation instruments for the Laser Interferometer Gravitational Wave Observatory (LIGO)
• Wideband dual sphere detector of gravitational waves
• The TIGA technique for detecting gravitational waves with a spherical antenna
• Thermal and back-action noises in dual-sphere gravitational-waves detectors
• Room temperature GW bar detector with opto-mechanical readout
• The mathematical theory of resonant transducers in a spherical gravity wave antenna

Cited by in corpus (14)

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• Dynamical non-axisymmetric instabilities in rotating relativistic stars
• Complete model of a spherical gravitational wave detector with capacitive transducers. Calibration and sensitivity optimization
• Principles of wide bandwidth acoustic detectors and the single-mass DUAL detector
• Microwave apparatus for gravitational waves observation
• A theoretical approach to thermal noise caused by an inhomogeneously distributed loss -- Physical insight by the advanced modal expansion
• Sensitivity below the standard quantum limit in gravitational wave detectors with Michelson-Fabry-Perot readout
• High frequency sources of gravitational waves
• A kg-mass prototype demonstrator for DUAL gravitational wave detector: opto-mechanical excitation and cooling