L^2 Curvature Bounds on Manifolds with Bounded Ricci Curvature
Kähler Geometry, Einstein Metrics, and Generalizations March 21, 2016 - March 25, 2016
Location: SLMath: Eisenbud Auditorium
algebraic geometry and GAGA
complex differential geometry
mathematical physics
Kahler metric
mirror symmetry
curvature estimates
Ricci curvature lower bounds
geometric analysis
51D25 - Lattices of subspaces and geometric closure systems [See also 05B35]
51E14 - Finite partial geometries (general), nets, partial spreads
51A40 - Translation planes and spreads in linear incidence geometry
51A50 - Polar geometry, symplectic spaces, orthogonal spaces
51A25 - Algebraization in linear incidence geometry [See also 12Kxx, 20N05]
51A05 - General theory of linear incidence geometry and projective geometries
14468
Consider a Riemannian manifold with bounded Ricci curvature |Ric|\leq n-1 and the noncollapsing lower volume bound Vol(B_1(p))>v>0. The first main result of this paper is to prove the previously conjectured L^2 curvature bound \fint_{B_1}|\Rm|^2 < C(n,v). In order to prove this, we will need to first show the following structural result for limits. Namely, if (M^n_j,d_j,p_j) -> (X,d,p) is a GH-limit of noncollapsed manifolds with bounded Ricci curvature, then the singular set S(X) is n-4 rectifiable with the uniform Hausdorff measure estimates H^{n-4}(S(X)\cap B_1)<C(n,v), which in particular proves the n-4-finiteness conjecture of Cheeger-Colding. We will see as a consequence of the proof that for n-4 a.e. x\in S(X) that the tangent cone of X at x is unique and isometric to R^{n-4}xC(S^3/G_x) for some G_x\subseteq O(4) which acts freely away from the origin. The proofs involve several new estimates on spaces with bounded Ricci curvature. This is joint work with Wenshuai Jiang
14468
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