报告一：

　　报告题目：Probing light dark matter in direct detections

　　报 告 人：武雷 教授（南京师范大学）

　　摘 要：Given the current strong constraints on WIMPs, search for light Dark Matter (DM) now is an essential task in direct detections. In order to overcome the limitation of low recoils, enhancing ionization rate of electron from Migdal effect and modifying the velocity distribution of DM from interaction of DM and cosmic rays are two important ways. In this work, I will introduce our work on these two aspects.

　　报告二：

　　报告题目：Two-component millicharged dark matter and the EDGES 21cm signal

　　报 告 人：刘佐伟 教授（南京大学）

　　摘 要：We propose a two-component dark matter explanation to the EDGES 21 cm anomalous signal. The heavier dark matter component is long-lived whose decay is primarily responsible for the relic abundance of the lighter dark matter which is millicharged. To evade the constraints from CMB, underground dark matter direct detection, and XQC experiments, the lifetime of the heavier dark matter has to be larger than $0.1 \tau_U$, where \tau_U$ is the age of the universe. Our model provides a viable realization of the millicharged dark matter model to explain the EDGES 21 cm, since the minimal model in which the relic density is generated via thermal freeze-out is ruled out by various constraints.

　　报告时间：2021年11月15日（周一）13:30--17:30

　　报告地点：紫台3号楼402教室

欢迎大家参加！