Solar Reflection of Dark Matter

by Mr Hailin Xu(徐海麟) (YITP, Stony Brook University)

Wednesday 24 Jul 2024, 10:00 → 12:00 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee Institute)

Abstract:

We consider the scattering of low-mass halo dark-matter particles in the hot plasma of the Sun, focusing on dark matter that interact with ordinary matter through a dark-photon mediator. The resulting “solar-reflected'' dark matter (SRDM) component contains high-velocity particles, which significantly extend the sensitivity of terrestrial direct-detection experiments to sub-MeV dark-matter masses. We use a detailed Monte-Carlo simulation to model the propagation and scattering of dark-matter particles in the Sun, including thermal effects, with special emphasis on ultralight dark-photon mediators. We study the properties of the SRDM flux, obtain exclusion limits from various direct-detection experiments, and provide projections for future experiments, focusing especially on those with silicon and xenon targets. We find that proposed future experiments with xenon and silicon targets can probe the entire “freeze-in benchmark”.

Biography:

Hailin Xu is currently a PhD candidate at the C. N. Yang Institute for Theoretical Physics, Stony Brook University. He completed his Bachelor degree in the Elite Program of Physics, KuangYaming Honor School, Nanjing University, in 2018.