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NCTS Differential Geometry Seminar
16:00 - 17:00, October 14, 2021 (Thursday)
Cisco Webex, Online seminar
(線上演講 Cisco Webex)
d_p Convergence and Epsilon-regularity Theorems for Entropy and Scalar Curvature Lower Bound
Man Chun Lee (The Chinese University of Hong Kong)


In this talk, we consider Riemannian manifolds with almost non-negative scalar curvature and Perelman entropy. We establish an epsilon-regularity theorem showing that such a space must be close to Euclidean space in a suitable sense. We will illustrate examples showing that the result is false with respect to the Gromov-Hausdorff and Intrinsic Flat distances, and more generally the metric space structure is not controlled under entropy and scalar lower bounds. We will introduce the notion of the d_p distance between (in particular) Riemannian manifolds, which measures the distance between W^{1,p} Sobolev spaces, and it is with respect to this distance that the epsilon regularity theorem holds. This is joint work with A. Naber and R. Neumayer.
Meeting number (access code): 2518 400 5755
Meeting password: WnqQftvk526 (96773885 from phones and video systems)


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