Wideband dual sphere detector of gravitational waves

Abstract

We present the concept of a sensitive AND broadband resonant mass gravitational wave detector. A massive sphere is suspended inside a second hollow one. Short, high-finesse Fabry-Perot optical cavities read out the differential displacements of the two spheres as their quadrupole modes are excited. At cryogenic temperatures one approaches the Standard Quantum Limit for broadband operation with reasonable choices for the cavity finesses and the intracavity light power. A molybdenum detector of overall size of 2 m, would reach spectral strain sensitivities of 2x10^-23/Sqrt{Hz} between 1000 Hz and 3000 Hz.

4 pages, 3 figures. Changed content. To appear in Phys. Rev. Lett

References in corpus (8)

• Measuring gravitational waves from binary black hole coalescences: I. Signal to noise for inspiral, merger, and ringdown
• Thermoelastic effects at low temperatures and quantum limits in displacement measurements
• What can we learn about GW Physics with an elastic spherical antenna?
• The TIGA technique for detecting gravitational waves with a spherical antenna
• A hollow sphere as a detector of gravitational radiation
• Data conditioning for gravitational wave detectors: A Kalman filter for regressing suspension violin mode
• Gravitational-Wave Stochastic Background Detection with Resonant-Mass Detectors
• The mathematical theory of resonant transducers in a spherical gravity wave antenna

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