Analysis & PDE Vol. 13, No. 5, 2020

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When does a perturbed Moser–Trudinger inequality admit an extremal?

Pierre-Damien Thizy

Vol. 13 (2020), No. 5, 1371–1415

DOI: 10.2140/apde.2020.13.1371

Abstract

We are interested in several questions raised mainly by Mancini and Martinazzi (2017) (see also work of McLeod and Peletier (1989) and Pruss (1996)). We consider the perturbed Moser–Trudinger inequality $I_{α}^{g} (Ω)$ at the critical level $α = 4 π$ , where $g$ , satisfying $g (t) \to 0$ as $t \to + \infty$ , can be seen as a perturbation with respect to the original case $g \equiv 0$ . Under some additional assumptions, ensuring basically that $g$ does not oscillate too fast as $t \to + \infty$ , we identify a new condition on $g$ for this inequality to have an extremal. This condition covers the case $g \equiv 0$ studied by Carleson and Chang (1986), Struwe (1988), and Flucher (1992). We prove also that this condition is sharp in the sense that, if it is not satisfied, $I_{4 π}^{g} (Ω)$ may have no extremal.

Keywords

Moser–Trudinger inequality, blow-up analysis, elliptic equations, extremal function

Mathematical Subject Classification 2010

Primary: 35B33, 35B44, 35J15, 35J61

Milestones

Received: 6 February 2018

Revised: 13 March 2019

Accepted: 12 May 2019

Published: 27 July 2020

Authors

Pierre-Damien Thizy
Université Claude Bernard Lyon 1 CNRS UMR 5208 Institut Camille Jordan Villeurbanne France