BIMSA > BIMSA General Relativity Seminar Positive mass theorem and ALF instantons
Positive mass theorem and ALF instantons
Organizers
Lars Andersson , Alejandro Torres-Orjuela , Xiaoran Zhang
Speaker
Jian Wang
Time
Friday, January 9, 2026 4:30 PM - 5:30 PM
Venue
A3-2-301
Online
Zoom 787 662 9899 (BIMSA)
Abstract
The mass is a fundamental global geometric invariant. In this talk, we will present a mass inequality for asymptotically locally flat (ALF) 4-manifolds and explore its connections to some Ricci-flat 4-manifolds called ALF gravitational instantons. We will also discuss recent progress on their classification.
Speaker Intro
Jian Wang is a faculty member at the Academy of Mathematics and Systems Sciences, Chinese Academy of Sciences. He received his Ph.D. from Institut Fourier under the supervision of Gérard Besson, and subsequently held a postdoctoral position at Augsburg. He later served as a Simons Instructor at Stony Brook University. His current research focuses on connections between scalar/Ricci curvature and topological as well as geometric invariants.