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Uniqueness of weak solutions to the Ricci flow - part 1

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Richard Bamler
UC Berkeley
Mon, 2017-09-18 11:00 - 11:40
MPIM Lecture Hall

In his resolution of the Poincaré and Geometrization Conjectures, Perelman constructed Ricci flows in which singularities are removed by a surgery process. His construction depended on various auxiliary parameters, such as the scale at which surgeries are performed. At the same time, Perelman conjectured that there must be a canonical flow that automatically "flows through its surgeries”, at an infinitesimal scale. 

Recently, Kleiner and Lott constructed so-called Ricci flow space-times, which exhibit this desired behavior. In this lecture series, I will first review their construction. I will then present recent work of Bruce Kleiner and myself, in which we show that these Ricci flow space-times are in fact unique and fully determined by their initial data. Therefore, these flows can be viewed as “canonical”, hence confirming Perelman’s Conjecture. I will also discuss further applications of this uniqueness statement.

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