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Sharp conditions for the validity of the Bourgain–Brezis–Mironescu formula

Part of: Existence theories Classical measure theory Real functions

Published online by Cambridge University Press:  16 April 2024

Elisa Davoli Open the ORCID record for Elisa Davoli [Opens in a new window] ,
Giovanni Di Fratta  and
Valerio Pagliari Open the ORCID record for Valerio Pagliari [Opens in a new window]
Elisa Davoli
Affiliation:
Institute of Analysis and Scientific Computing, TU Wien, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria (elisa.davoli@tuwien.ac.at)
Giovanni Di Fratta
Affiliation:
Dipartimento di Matematica e Applicazioni ‘R. Caccioppoli’, Università degli studi di Napoli ‘Federico II’, Via Cintia, Complesso Monte S. Angelo, 80126 Naples, Italy (giovanni.difratta@unina.it)
Valerio Pagliari
Affiliation:
Institute of Analysis and Scientific Computing, TU Wien, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria (valerio.pagliari@tuwien.ac.at)
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Abstract

Following the seminal paper by Bourgain, Brezis, and Mironescu, we focus on the asymptotic behaviour of some nonlocal functionals that, for each $u\in L^2(\mathbb {R}^N)$, are defined as the double integrals of weighted, squared difference quotients of $u$. Given a family of weights $\{\rho _{\varepsilon} \}$, $\varepsilon \in (0,\,1)$, we devise sufficient and necessary conditions on $\{\rho _{\varepsilon} \}$ for the associated nonlocal functionals to converge as $\varepsilon \to 0$ to a variant of the Dirichlet integral. Finally, some comparison between our result and the existing literature is provided.

Keywords

nonlocal functionalsBourgain–Brezis–Mironescu formulafractional kernelsGagliardo seminormRadon measures

MSC classification

Primary: 26A33: Fractional derivatives and integrals
Secondary: 28A33: Spaces of measures, convergence of measures 49J45: Methods involving semicontinuity and convergence; relaxation
Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , First View , pp. 1 - 24
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Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of The Royal Society of Edinburgh

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