Calculus of Variations and Geometric Measure Theory

N. De Ponti - G. Stefani

Properties of Lipschitz smoothing heat semigroups

created by stefani on 01 Mar 2024
modified on 04 Mar 2024


Submitted Paper

Inserted: 1 mar 2024
Last Updated: 4 mar 2024

Year: 2024

ArXiv: 2403.00620 PDF


We prove several functional and geometric inequalities only assuming the linearity and a quantitative $\mathrm{L}^\infty$-to-Lipschitz smoothing of the heat semigroup in metric-measure spaces. Our results comprise a Buser inequality, a lower bound on the size of the nodal set of a Laplacian eigenfunction, and different estimates involving the Wasserstein distance. The approach works in large variety settings, including Riemannian manifolds with a variable Kato-type lower bound on the Ricci curvature tensor, $\mathsf{RCD}(K,\infty)$ spaces, and some sub-Riemannian structures, such as Carnot groups, the Grushin plane and the $\mathbb{SU}(2)$ group.

Keywords: Wasserstein distance, Heat semigroup, Infinitesimal Hilbertianity, smoothing property, indeterminacy, nodal set, Buser inequality