Demonstration That Differential Length Changes of Optical Cavities Are a Sensitive Probe for Ultralight Dark Matter

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Abstract
Measurements of differential length oscillations of Fabry-Perot cavities provide a sensitive and promising approach to searching for scalar ultralight dark matter (ULDM). The initial demonstration sets direct lower bounds that are 1 to 2 orders of magnitude lower for two model ULDM distributions—a standard galactic halo and a relaxion star bound to Earth—ranging over a decade of ULDM mass and Compton frequency. The demonstration suggests how a much higher sensitivity to a much larger ULDM mass range can be obtained.
Funding Information
  • John Templeton Foundation
  • David and Lucile Packard Foundation
  • National Science Foundation (PHY-2409472)
  • National Science Foundation (PHY-2111544)
  • Defense Advanced Research Projects Agency
  • W. M. Keck Foundation
  • Gordon and Betty Moore Foundation (GBMF12328)
  • Alfred P. Sloan Foundation (G-2023-21130)
  • Simons Foundation

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