English

On vanishing diffusivity selection for the advection equation

Analysis of PDEs 2025-07-08 v2

Abstract

We study the advection equation along vector fields singular at the initial time. More precisely, we prove that for divergence-free vector fields in Lloc1((0,T];BV(Td;Rd))L2((0,T)×Td;Rd)L^1_{loc}((0, T ]; BV (\mathbb{T}^d;\mathbb{R}^d))\cap L^2((0, T ) \times\mathbb{T}^d;\mathbb{R}^d), there exists a unique vanishing diffusivity solution. This class includes the vector field constructed by Depauw, for which there are infinitely many distinct bounded solutions to the advection equation.

Keywords

Cite

@article{arxiv.2411.12910,
  title  = {On vanishing diffusivity selection for the advection equation},
  author = {Giulia Mescolini and Jules Pitcho and Massimo Sorella},
  journal= {arXiv preprint arXiv:2411.12910},
  year   = {2025}
}
R2 v1 2026-06-28T20:05:40.228Z