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Lipschitz regularity of minimizers of variational integrals with variable exponents. (English) Zbl 1518.35307

Summary: In this paper we prove the Lipschitz regularity for local minimizers of convex variational integrals of the form \[ \mathfrak{F} ( v , \Omega ) = \int_\Omega F ( x , D v ( x ) ) d x , \] where, for \(n \geq 2\) and \(N \geq 1\), \(\Omega\) is a bounded open set in \(\mathbb{R}^n\), \(u \in \operatorname{W}^{1 , 1} ( \Omega , \mathbb{R}^N )\) and the energy density \(F : \Omega \times \mathbb{R}^{N \times n} \to \mathbb{R}\) satisfies the so called variable growth conditions. The main novelty here is that we assume an almost critical regularity in the Orlicz Sobolev setting for the energy density as a function of the \(x\) variable.

MSC:

35J50 Variational methods for elliptic systems
35A15 Variational methods applied to PDEs
35B65 Smoothness and regularity of solutions to PDEs

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