中国科学院云南天文台学术报告通知

2026年第34期

报告题目：Non-Gaussianity and population statistics of nHz gravitational waves

报告人：Assoc. Prof. Zhen PAN 

报告人单位：Shanghai Jiao Tong University

报告语言：中文/ English

报告时间：2026年8月6日（星期四）15:00-16:00

报告地点：科研1号楼222会议室

报告摘要：

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The recent detection of a nanohertz gravitational wave (GW) background by pulsar timing arrays (PTA) has sparked extensive discussions regarding its origin-whether it arises from astrophysical supermassive black hole binaries (SMBHBs) or from primordial GWs generated by various early universe processes. Previous studies suggest that a key discriminant between these two origins is the non-Gaussianity of the GW background prior to the detection of any individual source. In this talk, we introduce a hierarchical Bayesian inference framework for inferring population properties of GW sources. This approach enables not only the measurement of evidence for different GW origins using PTA data but also the inference of population properties of astrophysical SMBHBs, by optimally leveraging non-Gaussian information in individual bright sources and in power spectrum fluctuations of the GW background.

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报告人简介： 

Zhen Pan received his Bachelor's degree in physics in 2010 and Master's degree in astronomy in 2013 from the University of Science and Technology of China, and his Ph.D. in cosmology in 2018 from the University of California, Davis. He then worked as a postdoctoral fellow at the Perimeter Institute for Theoretical Physics from 2018 to 2023. In June 2023, he joined the T.D. Lee Institute and the Department of Astronomy, Shanghai Jiao-Tong University. His current research interests focus on two-body and many-body problems in relativistic astrophysics.

云台邀请方： 南方基地

邀请方联系人：董小波