Lagrangian flows for vector fields with anisotropic regularity

  • Gianluca Crippa

    Departement Mathematik und Informatik, Universität Basel, Spiegelgasse 1, CH-4051, Basel, Switzerland
  • Anna Bohun

    Departement Mathematik und Informatik, Universität Basel, Spiegelgasse 1, CH-4051, Basel, Switzerland
  • François Bouchut

    Université Paris-Est, Laboratoire d'Analyse et de Mathématiques Appliquées (UMR 8050), CNRS, UPEM, UPEC, F-77454, Marne-la-Vallée, France

Abstract

We prove quantitative estimates for flows of vector fields subject to anisotropic regularity conditions: some derivatives of some components are (singular integrals of) measures, while the remaining derivatives are (singular integrals of) integrable functions. This is motivated by the regularity of the vector field in the Vlasov–Poisson equation with measure density. The proof exploits an anisotropic variant of the argument in [14,20] and suitable estimates for the difference quotients in such anisotropic context. In contrast to regularization methods, this approach gives quantitative estimates in terms of the given regularity bounds. From such estimates it is possible to recover the well posedness for the ordinary differential equation and for Lagrangian solutions to the continuity and transport equations.

Cite this article

Gianluca Crippa, Anna Bohun, François Bouchut, Lagrangian flows for vector fields with anisotropic regularity. Ann. Inst. H. Poincaré Anal. Non Linéaire 33 (2016), no. 6, pp. 1409–1429

DOI 10.1016/J.ANIHPC.2015.05.005