Ricci Curvature and Differential Harnack Inequalities on Path Space.

Aaron Naber (Northwestern University)

16-Jul-2020, 14:00-14:50 (4 years ago)

Abstract: There has been an observation of late that many analytic estimates on manifolds M with lower Ricci curvature bounds have counterparts on the path space PM of the manifold when there are two sided bounds on Ricci curvature. We will begin reviewing some of these, in particular the estimates of [Nab],[Has-Nab] which generalize the Bakry-Emery-Ledoux estimates to path space. We will then discuss new results, which are joint with Haslhofer and Knofer, which generalize the Li-Yau differential harnack inequalities to the path space, under the assumption of two sided Ricci curvature bounds.

To accomplish this, we will introduce a family of Laplace operators on path space PM, built from finite dimensional traces of the Markovian hessian, which we will review. The differential harnacks will take the form of differential inequalities for these operators, and will recover the classical Li-Yau when applied the simplest functions on path space, namely the cylinder functions of one variable.

analysis of PDEs

Audience: researchers in the topic


PDE seminar via Zoom

Organizer: Quoc-Hung Nguyen*
*contact for this listing

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