By exploiting Perelman’s pseudolocality theorem, we prove a new compactness theorem for Ricci flows. By optimising the theory in the two-dimensional case, and invoking the theory of quasiconformal maps, we establish a new existence theorem which generates a Ricci flow starting at an arbitrary incomplete metric, with Gauss curvature bounded above, on an arbitrary surface. The criterion we assert for well-posedness is that the flow should be complete for all positive times; our discussion of uniqueness also invokes pseudolocality.
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Peter Topping, Ricci flow compactness via pseudolocality, and flows with incomplete initial metrics. J. Eur. Math. Soc. 12 (2010), no. 6, pp. 1429–1451DOI 10.4171/JEMS/237