Speaker: 甘文聪博士，江西师范大学

Inviter: 吴小宁研究员

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

Language: Chinese

Time & Venue: 2024.10.31 20:00 腾讯会议 848 607 955

Abstract: 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.