报告题目:RModifying gravity without extra degrees of freedom
报 告 人:高显 教授(国家四青人才),中山大学
研究方向:引力与宇宙学
报告时间:2024年11月12日(星期二)下午16:00
报告地点:量子楼410
报告摘要:
The detection of gravitational waves (GWs) has provided us with a novel tool to test gravitational theories, which also raises a fundamental question: is General Relativity the unique theory for the two tensorial degrees of freedom (TTDOFs) associated with the GWs? In other words, is it possible to modify gravity without introducing any extra degree of freedom? In this talk, we will first introduce the motivation and previous attempts to build gravity theories with only TTDOFs. We will then discuss our results in building such TTDOF theories in the framework of spatially covariant gravity, including: 1) the conditions for the Lagrangian to propagate only the TTDOFs, and 2) constructing the Hamiltonian directly with auxiliary constraints.
报告人简介:
高显,中山大学物理与天文学院教授,博士生导师,国家四青人才。2010年博士毕业于中国科学院理论物理研究所,先后在法国巴黎第七大学、日本东京工业大学和东京大学从事博士后研究,2016年进入中山大学工作。主要研究方向为:引力理论的构造与自洽性分析,修改理论的宇宙学扰动与引力波效应。在国内外学术刊物发表学术论文60余篇,出版教材1部。现任中国物理学会引力与相对论天体物理分会委员。