Abstract:In this note, we establish a local maximum principle along Ricci flow under scaling invariant curvature condition. This unifies the known preservation of nonnegativity results along Ricci flow with unbounded curvature. By combining with the Dirichlet heat kernel estimates, we also give a more direct proof of Hochard's [14] localized version of a maximum principle given by R. Bamler, E. and B. Wilking [2] on the lower bound of curvature conditions.
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