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We propose a novel resonant sensor for detecting gravitational waves. This device, using optical trapping, offers superior sensitivity and a smaller footprint than current observatories, expanding the search for cosmic phenomena.

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Area of Science:

  • Astrophysics
  • Gravitational Wave Astronomy
  • Quantum Sensing

Background:

  • Current gravitational wave observatories have limitations in sensitivity and frequency range above 100 kHz.
  • Exploring new detection methods is crucial for expanding our understanding of the universe.

Purpose of the Study:

  • To propose a tunable resonant sensor for detecting gravitational waves in the 50-300 kHz range.
  • To demonstrate a potential improvement in sensitivity and size compared to existing laser-based observatories.

Main Methods:

  • Utilizing optically trapped and cooled dielectric microspheres or microdisks as resonant sensors.
  • Developing a technique to enhance sensitivity for gravitational wave detection.

Main Results:

  • The proposed sensor can exceed the sensitivity of current laser-based gravitational wave observatories in the specified frequency range.
  • The instrument is significantly smaller (a few percent) than existing observatories.

Conclusions:

  • This technology offers a pathway to extend the search volume for gravitational wave sources above 100 kHz by 1-3 orders of magnitude.
  • The sensor could detect monochromatic gravitational radiation from QCD axion annihilation around black holes via superradiance.