Abstract

We obtain a compactness result for Fano manifolds and Kahler Ricci flows. Comparing to the more general Riemannian versions in Anderson (Invent Math 102(2):429–445, 1990) and Hamilton (Am J Math 117:545–572, 1995), in this Fano case, the curvature assumption is much weaker and is preserved by the Kahler Ricci flows. One assumption is the $$C^1$$ boundedness of the Ricci potential and the other is the smallness of Perelman’s entropy. As one application, we obtain a new local regularity criteria and structure result for Kahler Ricci flows. The proof is based on a Holder estimate for the gradient of harmonic functions and mixed derivative of Green’s function.

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