讲座主题：Dark Matter Constraints from M87* Inner Shadow and Diffuse Galactic Radio Observations

专家姓名：丁然

工作单位：安徽大学

讲座时间：2025年05月14日10:00-11:00

讲座地点：莱山区祥隆中心A 座 4 楼

主办单位：烟台大学物理与电子信息学院

内容摘要：

In this talk, we present the sophisticated calculation of synchrotron emission resulting from DM annihilation in the vicinity of SMBH M87* and within the Galactic halo, which can be strongly constrained by the EHT observations, as well as the rdaio and microwave surveys of the Mike Way.

For EHT image constraints, we develope a comprehensive framework to calculate electron-positron propagation under strong gravity and magnetic fields, based on GRMHD simulations that are best-fit to current intensity and polarimetric observations of the SMBH.

For Mike Way rdaio constraints, we impose constraints for both total intensity and morphology of individual sky maps, by using a state-of-the-art cosmic-ray propagation code, coupled with a best-fit foreground model. This approach substantially refined the existing limits.

Our study shows a possible way for DM detection via the morphological analysis of BH images, as well as radio sky maps of the Milky Way. These results provide immediate relevance and significance, demonstrating the ability of existing EHT and rdaio data sets to contribute to DM studies.

主讲人介绍：

丁然，2014年毕业于南开大学物理学院获博士学位；2014 年-2019 年于北京大学高能物理研究中心 任博士后；2019年12月至今任安徽大学物理与光电工程学院副教授。长期从事粒子天体物理、宇宙学和对撞机唯象学的相关研究。具体研究内容包括：

（1）粒子天体物理：粒子暗物质模型及唯象学，轻暗物质相关的直接探测、间接探测和宇宙学效应；

（2）中微子物理：中微子质量产生和轻子生成机制；

（3）与早期宇宙及新物理相关的宇宙学随机引力波背景。