Covariant phase space with null boundaries

作     者：Kai Shi Xuan Wang Yihong Xiu Hongbao Zhang Kai Shi;Xuan Wang;Yihong Xiu;Hongbao Zhang

作者机构：Department of PhysicsBeijing Normal UniversityBeijing 100875China Theoretische NatuurkundeVrije Universiteit Brusseland The International Solvay InstitutesB-1050 BrusselsBelgium 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2021年第73卷第12期

页      面：111-118页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：partially supported by the National Science Foundation of China under the Grant No.11675015,11875095,and 12075026 supported in part by FWO Vlaanderen through the project G006918N by the Vrije Universiteit Brussel through the Strategic Research Program‘High-Energy Physics’ 

主　　题：covariant phase space null boundaries asymptotic symmetries 

摘      要：By imposing the boundary condition associated with the boundary structure of the null boundaries rather than the usual one,we find for Einstein’s gravity that the variational principle works only in its submanifold with the null boundaries given by the expansion-free and shearfree hypersurfaces rather than in the whole covariant phase *** implies that the key requirement in Harlow-Wu’s algorithm for the timelike boundaries is too restrictive for the null *** incorporate more generic situations into Harlow-Wu’s algorithm,we relax such a *** a result,we successfully reproduce the Hamiltonian obtained previously by Wald-Zoupas’prescription for Einstein’s gravity.