Article Dans Une Revue Analysis & PDE Année : 2024

Variational methods for the kinetic Fokker-Planck equation

Résumé

We develop a functional analytic approach to the study of the Kramers and kinetic Fokker-Planck equations which parallels the classical $H^1$ theory of uniformly elliptic equations. In particular, we identify a function space analogous to $H^1$ and develop a well-posedness theory for weak solutions in this space. In the case of a conservative force, we identify the weak solution as the minimizer of a uniformly convex functional. We prove new functional inequalities of Poincaré and Hörmander type and combine them with basic energy estimates (analogous to the Caccioppoli inequality) in an iteration procedure to obtain the~$C^\infty$ regularity of weak solutions. We also use the Poincaré-type inequality to give an elementary proof of the exponential convergence to equilibrium for solutions of the kinetic Fokker-Planck equation which mirrors the classic dissipative estimate for the heat equation. Finally, we prove enhanced dissipation in a weakly collisional limit.

Fichier principal
Vignette du fichier
hypo.pdf (653.42 Ko) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Licence

Dates et versions

hal-02144896 , version 1 (31-05-2019)
hal-02144896 , version 2 (19-02-2025)

Licence

Identifiants

Citer

Dallas Albritton, Scott Armstrong, Jean-Christophe Mourrat, Matthew Novack. Variational methods for the kinetic Fokker-Planck equation. Analysis & PDE, 2024, 17 (6), pp.1953-2010. ⟨10.2140/apde.2024.17.1953⟩. ⟨hal-02144896v2⟩
388 Consultations
1021 Téléchargements

Altmetric

Partager

  • More