Title: Metric geometry of Einstein 4-manifolds with special holonomy.
Speaker: Ruobing Zhang (Princeton University)
Date: 10 April 2023
Time: 8:30 pm
Venue: MS Teams (online)
This talk focuses on the recent resolutions of several well-known conjectures in studying the Einstein 4-manifolds with special holonomy.
The main results include the following.
(1) Any volume collapsed limit of unit-diameter Einstein metrics on the K3 manifold is isometric to one of the following: the quotient of a flat
3D torus by an involution, a singular special Kaehler metric on the topological 2-sphere, or the unit interval.
(2) Any complete non-compact hyperkaehler 4-manifold with quadratically integrable curvature, namely gravitational instanton, must have an
ALX model geometry with optimal asymptotic rate.
(3) Any gravitational instanton is biholomorphic to a dense open subset of some compact algebraic surface.