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The Regularity of the Linear Drift in Negatively Curved Spaces

About this Title

François Ledrappier and Lin Shu

Publication: Memoirs of the American Mathematical Society
Publication Year: 2023; Volume 281, Number 1387
ISBNs: 978-1-4704-5542-2 (print); 978-1-4704-7320-4 (online)
DOI: https://doi.org/10.1090/memo/1387
Published electronically: January 3, 2023
Keywords: Entropy, heat kernel, linear drift, locally symmetric space

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Table of Contents

Chapters

  • 1. Introduction and statement of results
  • 2. Preliminaries
  • 3. Regularity of the linear drift
  • 4. Brownian motion and stochastic flows
  • 5. The first differential of the heat kernels in metrics
  • 6. Higher order regularity of the heat kernels in metrics
  • 7. Regularity of the stochastic entropy

Abstract

We show that the linear drift of the Brownian motion on the universal cover of a closed connected smooth Riemannian manifold is $C^{k-2}$ differentiable along any $C^{k}$ curve in the manifold of $C^k$ Riemannian metrics with negative sectional curvature. We also show that the stochastic entropy of the Brownian motion is $C^1$ differentiable along any $C^{3}$ curve of $C^3$ Riemannian metrics with negative sectional curvature. We formulate the first derivatives of the linear drift and stochastic entropy, respectively, and show they are critical at locally symmetric metrics.

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