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Annales de l'Institut Henri Poincaré. C, Analyse non Linéaire
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Hölder continuity for a drift-diffusion equation with pressure

Authors: Silvestre, Luis; Vicol, Vlad;

Hölder continuity for a drift-diffusion equation with pressure

Abstract

We address the persistence of Hölder continuity for weak solutions of the linear drift-diffusion equation with nonlocal pressure u_{t} + b \cdot \mathrm{∇}u− \bigtriangleup u = \mathrm{∇}p,\:\mathrm{∇} \cdot u = 0 on [0,\infty) \times \mathbb{R}^{n} , with n \geq 2 . The drift velocity b is assumed to be at the critical regularity level, with respect to the natural scaling of the equations. The proof draws on Campanatoʼs characterization of Hölder spaces, and uses a maximum-principle-type argument by which we control the growth in time of certain local averages of u . We provide an estimate that does not depend on any local smallness condition on the vector field b , but only on scale invariant quantities. Résumé Nous abordons la question de la persistance de la continuité Hölder pour les solutions faibles de lʼéquation linéaire de dérive-diffusion avec une pression non-locale u_{t} + b \cdot \mathrm{∇}u− \bigtriangleup u = \mathrm{∇}p,\:\mathrm{∇} \cdot u = 0 sur [0,\infty) \times \mathbb{R}^{n} , avec n \geq 2 . On suppose que la vitesse de dérive b est au niveau critique de régularité par rapport au changement dʼéchelle de lʼéquation. La démonstration sʼappuie sur la définition des espaces Hölder de Campanato, et elle utilise un argument de principe du maximum par lequel nous contrôlons la croissance en temps de certaines moyennes locales de u . Nous fournissons une estimation qui ne dépend dʼaucune condition de petitesse locale sur le champ de vecteur b , mais seulement sur des quantités invariantes par changement dʼéchelle.

Keywords

Mathematics - Analysis of PDEs, 35K10, 35B65, 35R05, Second-order parabolic equations, Smoothness and regularity of solutions to PDEs, FOS: Mathematics, divergence free drift term, Campanato spaces, Mathematical Physics, Analysis, Analysis of PDEs (math.AP)

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
13
Average
Top 10%
Average
Green
gold