报告时间：2021 年 3 月 11 日（周四）15：30                                                                                     

报告地点：在线报告（ 腾讯会议 ID : 375 3347 0839）

报告摘要：

The gravitational waves (GWs), which are the two tensorial (TT) modes in the metric, are the only propagating modes in the general relativity (GR). Is GR the unique gravitational theory that propagates the TT modes only? Is it possible to modify GR without introducing extra mode(s) other than the TT modes? We investigate the possibility for having the TT modes only in a large class of modified gravity theories that respect spatial covariance. Generally, there are three modes propagating in such theories, of which two are tensorial and one is of the scalar type. Interestingly, for theories with metric variables only and with auxiliary variable(s), we managed to find conditions to eliminate the scalar mode so that only the TT modes are propagating. As the "minimally" modification of GR, such theories can be tested against the observations, and also supply us a broader playground to questioning the uniqueness of GR. 

报告人简介：

高显，男，中山大学物理与天文学院教授，博士生导师。研究领域为广义相对论、修改引力、暴胀与早期宇宙等。2005年毕业于北京航空航天大学电气工程及其自动化专业，获工学学士学位。2010年毕业于中国科学院理论物理研究所，获理论物理专业博士学位。此后在法国巴黎第七大学、日本东京工业大学、东京大学做博士后研究。2016年9月回国进入中山大学工作。在PRL等国际主流物理学期刊发表SCI论文40余篇，据高能物理数据库Inspire统计，总引用2400余次，h指数为22。

视频链接：

https://www.bilibili.com/video/BV1PU4y187Ls