【3.14; Seminar】2025年粒子天体物理全国重点实验室系列学术报告 #3：Multi-Messenger Emissions from Cosmic Transients: Theoretical Modeling and Future Detectability

时间/Time: 3月14日下午2:00/Friday, March 14 at 2:00 p.m.

地点/Location: 多学科楼228会议室/Meeting Room 228, Multidisciplinary Building

报告人/Speaker: 袁成超/Dr. Chengchao Yuan (DESY)

题目/Title: Multi-Messenger Emissions from Cosmic Transients: Theoretical Modeling and Future Detectability

主持人/Host: 张兵 副研究员/Bing ZHANG

腾讯会议：646-202-227

摘要/Abstract:

Cosmic transients, such as gamma-ray bursts (GRBs), tidal disruption events (TDEs), and flares of low-luminosity active galactic nuclei (LLAGNs), are interesting multi-messenger sources of high-energy neutrinos, gamma rays, and cosmic rays. Understanding their emission mechanisms requires a comprehensive theoretical and computational framework that accounts for time-dependent, multi-wavelength, and multi-messenger processes. In this talk, I will present AM3 (Astrophysical Multi-Messenger Modeling), an open-source software designed to self-consistently simulate the coupled evolution of photons, leptons, and hadrons in astrophysical environments. I will discuss its applications to various transient sources, including GRB afterglows, neutrino-coincident TDEs, and TeV-emitting LLAGNs, highlighting how lepto-hadronic interactions shape their observed spectra and light curves. Furthermore, I will explore the implications of these models for future high-sensitivity observatories, particularly LHAASO, LACT and HUNT, and how upcoming multi-messenger observations can refine our understanding of particle acceleration in extreme cosmic environments.

报告人简介/Bibliography:

Dr. Chengchao Yuan has been a postdoctoral researcher at Deutsches Elektronen-Synchrotron (DESY) since October 2022. He obtained his Ph.D. in Physics from Pennsylvania State University in August 2022. Before that, Chengchao earned his B.Sc. in Astronomy from Nanjing University. Chengchao’s research focuses on theoretical and numerical multi-messenger astrophysics, including the origins and implications of high-energy photons, cosmic rays, and neutrinos from extreme cosmic sources and source populations. He is interested in how multi-messenger analyses enhance our understanding of the physical nature of high-energy astrophysical phenomena with current and future high-sensitivity observatories.