讲座名称：CAUSALITY COMPARISON AND POSITIVE MASS（因果性比较和正质量）

主讲人：吴小宁

时间：2021年9月22日  16:00

地点：汇贤楼221学术报告厅

主办单位：数学科学学院

报告摘要

Penrose et al. investigated the physical incoherence of the space-time with negative mass via the bending of light. Precise estimates of the time-delay of null geodesics were needed and played a pivotal role in their proof. In this paper, we construct an intermediate diagonal metric and reduce this problem to a causality comparison in the compactified space-time regarding time-like connectedness near conformal infinities. This different approach allows us to avoid encountering the difficulties and subtle issues that Penrose et al. met. It provides a new, substantially simple, and physically natural non-partial differential equation viewpoint to understand the positive mass theorem. This elementary argument modestly applies to asymptotically flat solutions that are vacuum and stationary near infinity.

专家简介

吴小宁，2001年博士毕业于中科院数学与系统科学研究院，导师为王世坤研究员，2002年在德国马普引力研究所做洪堡学者，2004年在台湾中央大学做博士后，2007年入职中科院数学与系统科学研究院，目前任数学所研究员。2016年和2021年两次当选中国物理学会引力与相对论天体物理分会理事，近年来主持国家自然科学基金面上3项，参加重点项目2项。个人研究兴趣为经典广义相对论、黑洞物理、数学物理。