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arXiv · 2501.14949

Geomagnetic constraints on Millicharged Dark Matter

Ariel Arza·Yuanlin Gong·Jing Shu·Lei Wu·Qiang Yuan·Bin Zhu
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Abstract

Millicharged particles are well-motivated dark matter candidates arising in many extensions of the Standard Model. We show that, despite their tiny coupling $e_m$ to photons, millicharged dark matter (mDM) in the Earth's geomagnetic field can generate a quasi-static, monochromatic magnetic signal with angular frequency twice the mDM mass. Using null results from the SuperMAG and SNIPE Hunt collaborations, we constrain the effective charge of bosonic mDM in the mass range $10^{-18}$--$10^{-14}\,\text{eV}$. The resulting upper bounds exceed stellar cooling constraints by over thirteen orders of magnitude, demonstrating the power of this method.

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Ariel Arza, Yuanlin Gong, Jing Shu, Lei Wu, Qiang Yuan, Bin Zhu. 2025-01-24. Geomagnetic constraints on Millicharged Dark Matter. https://arxiv.org/abs/2501.14949

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