a polyhedron comparison theorem for 3-manifolds with positive scalar curvature

a polyhedron comparison theorem for 3-manifolds with positive scalar curvature

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Chao Li, Stanford
Fine Hall 314

 We establish a comparison theorem for polyhedra in 3-manifolds with nonnegative scalar curvature, answering affirmatively a dihedral rigidity conjecture by Gromov. For a large collections of polyhedra with interior non-negative scalar curvature and mean convex faces, we prove the dihedral angles along its edges cannot be everywhere less or equal than those of the corresponding Euclidean model, unless it is a isometric to a flat polyhedron.