100, rue des maths 38610 Gières / GPS : 45.193055, 5.772076 / Directeur : Louis Funar

Claude Lebrun

Mass, Scalar Curvature, Kähler Geometry, and All That
Jeudi, 2 Mai, 2019 - 16:30 à 17:30

Given a complete Riemannian manifold that looks enough like Euclidean space at infinity, physicists have defined a quantity called the “mass” that measures the asymptotic deviation of the geometry from the Euclidean model. After first providing a self-contained introduction to the key underlying geometric concepts, I will go on to
explain a simple formula, discovered in joint work with Hajo Hein, for the mass of any asymptotically locally Euclidean (ALE) Kähler manifold. When the metric is actually AE (asymptotically Euclidean), our formula not only implies the positive mass theorem for Kähler metrics, but also yields a Penrose-type inequality for the mass. I will also briefly indicate some recent technical improvements that allow one to prove these results assuming only minimal metric fall-off assumptions at infinity.

Stony Brook University
Amphi Chabauty
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