講座主題：Dark Matter Constraints from M87* Inner Shadow and Diffuse Galactic Radio Observations
專家姓名：丁然
工作單位：安徽大學
講座時間：2025年05月14日10:00-11:00
講座地點：萊山區祥隆中心A 座 4 樓
主辦單位：煙臺大學物理與電子信息學院
內容摘要：
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.
主講人介紹：
丁然，2014年畢業于南開大學物理學院獲博士學位；2014 年-2019 年于北京大學高能物理研究中心 任博士后；2019年12月至今任安徽大學物理與光電工程學院副教授。長期從事粒子天體物理、宇宙學和對撞機唯象學的相關研究。具體研究內容包括：
（1）粒子天體物理：粒子暗物質模型及唯象學，輕暗物質相關的直接探測、間接探測和宇宙學效應；
（2）中微子物理：中微子質量產生和輕子生成機制；
（3）與早期宇宙及新物理相關的宇宙學隨機引力波背景。
