Title: General Covariance inEffective Quantum Black Hole Models

Speaker: 张聪

      张聪博士现为北京师范大学讲师。本科毕业于北师大天文系，博士毕业于北师大物理系。曾在波兰华沙大学和德国埃尔朗根--纽伦堡大学从事博士后研究工作。目前主要研究兴趣集中于圈量子引力和圈量子黑洞，在PRL，PRD，CQG和RAA等刊物发表文章30余篇。

Abstract:

     In this talk,I will present a series of results concerning general covariance ineffective quantum black hole (BH) models. Within the framework of sphericallysymmetric models, general covariance is precisely formulated as a set ofequations, leading to necessary and sufficient conditions for a generally covarianttheory. Using these conditions, we derive equations for the effective Hamiltonianconstraint and solve them to obtain the most general form of the Hamiltonianconstraint describing generally covariant BH models. Remarkably, the results showthat any one-parameter family of static, spherically symmetric spacetime metricscan be embedded as the unique vacuum solution set of a generally covarianttheory of pure gravity. This provides a complete resolution to the inverse problemof Birkhoff's theorem and establishes a systematic method for reconstructingcovariant dynamics from a given geometry. Finally, we apply this framework tcloop quantum gravity-inspired spacetimes and derive the corresponding covarianteffective Hamiltonian constraint.

Host: Wei-jia Li

2025年11月25日 16:00, 厚兴楼(建工学部)405