马永革教授，北京师范大学，于2025年3月27日16:00在物质科研楼C座11层1124做题为“Covariance in Spherically Symmetric Effective Models and Quantum Black Holes”的报告，欢迎感兴趣者参加。

Topic: Covariance in Spherically Symmetric Effective Models and Quantum Black Holes

Speaker: Prof. Yongge Ma

Coordinates: PCFT C1124, 16:00, Thursday, March 27

Abstract: The issue of general covariance in effective models of quantum gravity is addressed, which arises when canonical quantum gravity leads to a semiclassical model described by an effective Hamiltonian constraint. In the context of spherically symmetric models, general covariance is precisely formulated into a set of equations, leading to the necessary and sufficient conditions for ensuring covariance. Two candidates for effective Hamiltonian constraints, satisfying the covariance conditions and depending on a quantum parameter, are proposed. The resulting quantum modified black hole spacetimes show dramatically different structure from those of classical black holes.