中科院数学与系统科学研究院

数学研究所

学术报告

数学物理研讨班

报告人：甘文聪(博士) 江西师范大学

题  目: Nonexistence of quantum black and white hole horizons in an improved dynamic approach

时  间：2024年10月31日（星期四）20：00-21：00

地  点：腾讯会议 848 607 955 

摘  要：In this work, we study the quantum geometric effects near the locations where classical black hole horizons used to appear in Einstein’s classical theory, within the framework of an improved dynamic approach, in which the internal region of a black hole is modeled by the Kantowski-Sachs (KS) spacetime and the two polymerization parameters are functions of the phase space variables. Our detailed analysis shows that the effects are so strong that black and white hole horizons of the effective quantum theory do not exist at all and instead are replaced by transition surfaces, across which the metric coefficients and their inverses are smooth and remain finite, as are the corresponding curvatures, including the Kretschmann scalar. These surfaces always separate trapped regions from anti-trapped regions. The number of such surfaces is infinite, so the corresponding KS spacetimes become geodesically complete, and no black and white hole-like structures exist in this scheme.