Preprint

Inserted: 16 jul 2024
Last Updated: 30 sep 2026

Year: 2026
Links: link to ResearchGate

Abstract:

We extend the De Giorgi--Nash--Moser theory to nonlocal hypoelliptic equations arising in kinetic theory as linearized models for the non-cutoff Boltzmann equation. Assuming that the nonlocal tail in velocity of weak solutions belongs locally to $L^p_{t,x}$ for some $p>N_{\tt d}/(2s)$, where $N_{\tt d}$ is the drift homogeneous dimension and $2s\in(0,2)$ is the order of diffusion, we prove a local $L^2$-$L^\infty$ estimate, from which we also deduce a nonlocal strong Harnack inequality. The tail summability threshold for the local estimate is optimal: for every $1\leq p \leq N_{\tt d}/(2s)$, we construct a family of nonnegative, time-dependent solutions that rules out this estimate even for the pure fractional Kolmogorov equation. The local boundedness estimate also allows for possibly unbounded source terms.

Download:

• APP26-NonlocDG-kin.pdf