【2.9; Seminar】2026年粒子天体物理全国重点实验室系列学术报告 #7：The Nearby-Source Model for Cosmic Rays: Propagation and Implications

时间/Time: 2026年2月9日周一上午9:30 / Monday, February 9, 2026, 9:30 a.m.

地点/Location: 多学科楼229会议室 / Meeting Room 229, Multidisciplinary Building

报告人/Speaker: 乔冰强（DESY, Germany）/ Bingqiang Qiao (DESY, Germany)

题目/Title: The Nearby-Source Model for Cosmic Rays: Propagation and Implications

主持人/Host: 毕效军 研究员 / Prof. Bixiaojun

摘要/Abstract:  Understanding how cosmic rays propagate from their sources through the magnetized interstellar medium has long been a central problem in high-energy astrophysics. Conventional propagation models predict that cosmic-ray observables should follow simple power-law behaviors. However, recent high-precision measurements reveal complex fine structures in energy spectra, large-scale anisotropies, and diffuse gamma-ray emission, posing serious challenges to traditional models. Identifying the physical origin of these structures across multi-messenger observations is therefore crucial for understanding the properties of the interstellar medium and CR transport throughout the whole Galaxy. We propose a unified framework that combines spatially dependent propagation with the contribution of a single nearby source, within which many of the observed anomalies can be naturally explained. Our results demonstrate that the spectral and anisotropic structures of CRs are not independent puzzles, but different manifestations of the same underlying local propagation physics. Building on this framework, my ongoing work aims to connect these phenomenological models to first-principles descriptions of MHD turbulence, with the goal of deriving spatially dependent cosmic-ray transport directly from the properties of turbulent magnetic fields.

个人简介/Biography:  Bingqiang Qiao obtained his Ph.D. degree in Astrophysics from the University of Science and Technology of China. He carried out his first postdoctoral research at the Institute of High Energy Physics, and is currently a postdoctoral researcher at DESY, Germany. At DESY, his research focuses primarily on MHD turbulence, with an emphasis on high-resolution numerical simulations and their implications for particle transport in the magnetized interstellar medium. Based on some MHD theory and radio polarization observations of sources such as SNRs, TeV halos, etc., he investigates the magnetic-field geometry in the vicinity of sources to achieve a deeper understanding of cosmic-ray diffusion mechanisms in source environments. He also worked on cosmic-ray propagation, which provides direct observational motivation for his current turbulence studies and offers the potential to link phenomenological transport models with first-principles plasma physics in explaining current observations.