Geomagnetic Signal of Millicharged Dark Matter

作     者：Arza, Ariel Gong, Yuanlin Shu, Jing Wu, Lei Yuan, Qiang Zhu, Bin 

作者机构：Department of Physics Institute of Theoretical Physics Nanjing Normal University Nanjing210023 China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing210023 China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing100871 China Center for High Energy Physics Peking University Beijing100871 China Beijing Laser Acceleration Innovation Center Huairou Beijing101400 China School of Astronomy and Space Science University of Science and Technology of China Hefei230026 China School of Physics Yantai University Yantai264005 China 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2025年

核心收录：

主　　题：Geomagnetism 

摘      要：Millicharge particles (mCPs) are viable dark matter candidates motivated by many standard model extensions. We show that despite of the tiny coupling with the photon, millicharged dark matters can convert efficiently to photons through annihilation processes in the Earth magnetic field background, which generates a monochromatic quasi static magnetic field signal with angular frequency being twice the millicharged particle mass. By recasting null results from the SuperMAG and the SNIPE Hunt collaborations, we constrain the effective charge of bosonic millicharged dark matter in the mass ranges 10−18−3.5×10−17 eV and 10−15−10−14 eV. Our bounds surpass current stellar cooling constraints by more than ten orders of magnitude, making this proposal a powerful tool to search for millicharged dark matter. Copyright © 2025, The Authors. All rights reserved.