English

A Bourgain-Brezis-Mironescu -type characterization for Sobolev differential forms

Analysis of PDEs 2025-05-16 v2 Differential Geometry Functional Analysis

Abstract

Given a bounded domain ΩRn\Omega \subset \mathbb{R}^n, a result by Bourgain, Brezis, and Mironescu characterizes when a function fLp(Ω)f \in L^p(\Omega) is in the Sobolev space W1,p(Ω)W^{1,p}(\Omega) based on the limiting behavior of its Besov seminorms. We prove a direct analogue of this result which characterizes when a differential kk-form ωLp(kTΩ)\omega \in L^p(\wedge^k T^* \Omega) has a weak exterior derivative dωLp(k+1TΩ)d\omega \in L^p(\wedge^{k+1} T^* \Omega), where the analogue of the Besov seminorm that our result uses is based on integration over simplices.

Keywords

Cite

@article{arxiv.2406.19834,
  title  = {A Bourgain-Brezis-Mironescu -type characterization for Sobolev differential forms},
  author = {Ilmari Kangasniemi},
  journal= {arXiv preprint arXiv:2406.19834},
  year   = {2025}
}

Comments

33 pages; updated version with the introduction significantly revised in order to state a version of the main result earlier and with less non-standard notation

R2 v1 2026-06-28T17:22:30.016Z