邀请人 (Invited by): 苗荣欣

时间 (Time): 星期五，2023/11/3-14:30-16:00

地点 (Location): 珠海校区瀚林3号B201会议室

摘要 (Abstract): 

 Sorce and Wald proposed a new version of gedanken experiments to examine the weak cosmic censorship conjecture (WCCC) in Kerr-Newmann(KN) black holes. However, their discussion only includes the second-order approximation of perturbation and there exists an optimal condition such that the validity of the WCCC is determined by the higher-order approximations. Therefore, in this paper, we extended their discussions into the high-order approximations to study the WCCC in a nearly extremal KN black hole. After assuming that the spacetime satisfies the stability condition and the perturbation matter fields satisfy the null energy condition, based on the Noether charge method by Iyer and Wald, we completely calculate the first four order perturbation inequalities and discuss the corresponding gedanken experiment to destroy the KN black hole. As a result, we find that the nearly extremal KN black holes cannot be destroyed under the fourth-order approximation of perturbation. Then, by using the mathematical induction, we strictly prove the nth order perturbation inequality when the first (n-1) order perturbation inequalities are saturated. Using these results, we find that the WCCC in KN black hole is valid under the higher-order approximation of perturbation. Our investigation implies that the WCCC might be strictly satisfied in KN black holes under the perturbation level.

  主讲人简介 (Speaker's CV): 

蒋杰，物理学博士，北京师范大学（珠海校区）特聘副研究员，2021年博士毕业于北京师范大学物理学系理论物理专业。主要从事引力理论与黑洞物理学的研究，目前对黑洞热力学、宇宙监督假设、全息纠缠熵和全息复杂度等方面的研究比较感兴趣。