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Millicharge Dark Matter Detection with Mach-Zehnder Interferometer

Chuan-Ren ChenBui Hong NhungChrisna Setyo Nugroho
Dec 2022
摘要
If the dark sector exists and communicates with Standard Model through the$U(1)$ mixing, it is possible that electromagnetism would have influence onmatter fields in dark sector, so-called millicharge particles (mCPs).Furthermore, the highest mCPs could be dark matter particles. Recently it hasbeen shown that the mCPs would be slowed down and captured by the earth. As aresult, the number density of accumulated mCPs underground is enhanced byseveral orders of magnitude as compared to that of dark matter in our solarsystem. In this study, we propose to use the Mach-Zehnder (MZ) laserinterferometer to detect earth bound mCPs through the detection of phase shiftsof photons. We show that, for mass of mCPs lager than $1$ GeV, the sensitivityof probing the mixing parameter $\epsilon$ could reach as low as $10^{-11}$ ifnumber density is larger than $1~\rm{cm^{-3}}$.
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