时间：2026年1月19日（周一）10:00-11:30
地点：E10-212
主持人：理论科学研究院，刘洪光
主讲人：兰州大学，刘玉孝
主讲人简介：Dr. Yu-Xiao Liu is a Professor and Doctoral Supervisor at the School of Physical Science and Technology, Lanzhou University. He was selected for the Ministry of Education's "New Century Excellent Talents Support Plan" in 2008, received funding from the National Natural Science Foundation of China for Young Scientists in 2015, and was selected for a national-level talent program in 2020. His primary research focuses on general relativity, higher-dimensional spacetime gravity, black holes, and gravitational waves. He has published more than 200 papers in international journals such as Physical Review Letters and Physical Review D.
讲座主题：Polarization Modes of Gravitational Waves
讲座摘要：This talk reviews recent progress in the study of gravitational wave polarizations and introduces a parameterized framework for analyzing polarization modes in a broad class of modified gravity theories. These theories satisfy the following conditions: (1) four-dimensional spacetime, (2) principle of least action, (3) general covariance, and (4) free particle motion described by the geodesic equation. Our findings indicate that the polarization modes of gravitational waves depend on the parameter space of the theory. Notably, some theories can permit up to six polarization modes. Furthermore, we discover that within a broad category of gravitational theories, the polarization modes of gravitational waves exhibit properties of universal significance.
