Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4592679 | Journal of Functional Analysis | 2008 | 15 Pages |
Abstract
In this paper, we derive a general evolution formula for possible Harnack quantities. As a consequence, we prove several differential Harnack inequalities for positive solutions of backward heat-type equations with potentials (including the conjugate heat equation) under the Ricci flow. We shall also derive Perelman's Harnack inequality for the fundamental solution of the conjugate heat equation under the Ricci flow.
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