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G2 Manifolds Program Seminar: Hans-Joachim Hein

Hans-Joachim Hein, University of Nantes

Title: Ricci-flat Metrics on A_k Singularities
Program: G2 Manifolds Program Seminar
Speaker: Hans-Joachim Hein, University of Nantes
Date: Wednesday, September 10, 2014
Time: 9:30am – 10:30am
Place: Lecture Hall 102, Simons Center




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Abstract: By work of Gauntlett-Martelli-Sparks-Yau, the 3-dimensional A_k singularity admits no Ricci-flat Kähler cone metrics for k > 2. We show that if k > 3, then A_k admits a Ricci-flat Kähler metric with an isolated point singularity whose Gromov-Hausdorff tangent cone has nonisolated singularities. These new metrics also give rise to counterexamples to various open questions in the geometry of Ricci curvature. Joint work with Aaron Naber.