时间：2019年4月9日（周二）上午10:00-11:30

　　地点：多学科大楼416

　　报告人：Cosimo Bambi (Department of Physics, Fudan University)

　　主持人：张澍 研究员

　　题目：Testing general relativity using X-ray reflection spectroscopy

　　摘要：

　　Einstein's theory of general relativity was proposed over 100 years ago and has successfully passed a large number of observational tests in weak gravitational fields. However, the strong field regime is still largely unexplored, and there are many modified and alternative theories that have the same predictions as Einstein's gravity for weak fields and present deviations only when gravity becomes strong. X-ray reflection spectroscopy is potentially a powerful tool for testing the strong gravity region around astrophysical black holes with electromagnetic radiation. In this talk, I will present the reflection model RELXILL_NK designed for testing the metric around black holes and the current constraints on possible new physics from the analysis of a few sources.

　　个人简介：

　　Cosimo Bambi is Xie Xide Junior Chair Professor at the Department of Physics at Fudan University (Shanghai, China) and a Humboldt Fellow at Eberhard Karls Universit？t Tübingen (Tübingen, Germany). He received his PhD from Ferrara University (Italy) in 2007, and was a postdoc at Wayne State University (Michigan), IPMU at The University of Tokyo (Japan), and at LMU Munich (Germany). He moved to Fudan University at the end of 2012 under the Thousand Young Talents Program. In 2016, he was awarded with a JSPS fellowship to visit Japan. In 2018, he received the Xu Guangqi Award (for the best Italian researcher in China). He regularly serves as referee for journals like PRL, ApJ, JHEP, JCAP, etc. and as proposal reviewer for the Chang Jiang Scholars Program (China), Czech Science Foundation (Czech Republic), German Research Foundation (Germany), and National Research Foundation (South Africa). His research interests cover several areas in gravity, cosmology, and high-energy astrophysics. He has published more than 100 papers on refereed journals as first or corresponding author, has over 3,000 citations, and his h-index is 34. He has authored two books, and edited one volume (in ASSL) with Springer.