Observational constraint on axion dark matter with gravitational waves

  title={Observational constraint on axion dark matter with gravitational waves},
  author={Takuya Tsutsui and Atsushi J. Nishizawa},
  journal={Physical Review D},
Most matter in the Universe is invisible and unknown, and is called dark matter. A candidate of dark matter is the axion, which is an ultralight particle motivated as a solution for the CP problem. Axions form clouds in a galactic halo, and amplify and delay a part of gravitational waves propagating in the clouds. The Milky Way is surrounded by the dark matter halo composed of a number of axion patches. Thus, the characteristic secondary gravitational waves are always expected right after the… 

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