$(K,N)$-convexity and the curvature-dimension condition for negative $N$

19 Jun 2015  ·  Ohta Shin-ichi ·

We extend the range of $N$ to negative values in the $(K,N)$-convexity (in the sense of Erbar--Kuwada--Sturm), the weighted Ricci curvature $Ric_N$ and the curvature-dimension condition $CD(K,N)$. We generalize a number of results in the case of $N>0$ to this setting, including Bochner's inequality, the Brunn--Minkowski inequality and the equivalence between $Ric_N \ge K$ and $CD(K,N)$... We also show an expansion bound for gradient flows of Lipschitz $(K,N)$-convex functions. read more

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Differential Geometry Analysis of PDEs Metric Geometry