Geomagnetic Signal of Millicharged Dark Matter

by Prof. Bin Zhu（祝斌） (Yantai University)

Thursday 13 Mar 2025, 11:00 → 12:00 Asia/Shanghai

Tsung-Dao Lee Institute/N4F-N400 - meeting room (Tsung-Dao Lee Institute)

Abstract：

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 $10^{-18} - 3.5 \times 10^{-17} \, \mathrm{eV}$ and $10^{-15} - 10^{-14} \, \mathrm{eV}$ . 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.

Biography:

祝斌，2014年于南开大学物理科学学院获得博士学位，随后进入中国科学院物理研究所从事博士后研究工作（2014-2016）。2016年加入烟台大学物理与电子信息学院，致力于粒子物理领域的教学与科研。2019年至2021年，他受邀赴韩国中央大学担任研究教授。2024年获聘烟台大学教授职位。研究聚焦于粒子物理领域，尤其在暗物质和新物理寻找方向。截至目前，他在《Physical Review Letters》、《Nature Communications》、《Science Bulletin》、《Physical Review D》等期刊上累计发表论文72篇，总被引用次数达1720次。

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