Detecting ultralight axion dark matter wind with laser interferometers
  The ultralight axion with mass around $10^{-22}$ eV is known as a candidate
of dark matter. A peculiar feature of the ultralight axion is oscillating
pressure in time, which produces oscillation of gravitational potentials. Since
the solar system moves through the dark matter halo at the velocity of about $v
\sim 300 \, \text{km} / \text{s} = 10^{-3}$, there exists axion wind, which
looks like scalar gravitational waves for us. Hence, there is a chance to
detect ultralight axion dark matter with a wide mass range by using laser
interferometer detectors. We calculate the detector signal induced by the
oscillating pressure of the ultralight axion field, which would be detected by
future laser interferometer experiments. We also argue that the detector signal
can be enhanced due to the resonance in modified gravity theory explaining the
dark energy.
