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arXiv · 1811.05003

On the detectability of ultralight scalar field dark matter with gravitational-wave detectors

Soichiro Morisaki·Teruaki Suyama
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Abstract

An ultralight scalar field is one of the dark matter candidates. If it couples with Standard Model particles, it oscillates mirrors in gravitational-wave detectors and generates detectable signals. We study the spectra of the signals taking into account the motion of the detectors due to the Earth's rotation/the detectors' orbital motion around the Sun and formulate a suitable data-analysis method to detect it. We find that our method can improve the existing constraints given by fifth-force experiments on one of the scalar field's coupling constants by a factor of $\sim 30$, $\sim 100$ and $\sim 350$ for $m_\phi = 2 \times 10^{-17}~\mathrm{eV},~10^{-14}~\mathrm{eV}$ and $10^{-12}~\mathrm{eV}$ respectively, where $m_\phi$ is the scalar field's mass. Our study demonstrates that experiments with gravitational-wave detectors play a complementary role to that Equivalence Principle tests do.

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Soichiro Morisaki, Teruaki Suyama. 2018-11-09. On the detectability of ultralight scalar field dark matter with gravitational-wave detectors. https://doi.org/10.1103/physrevd.100.123512

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