Abstract

Abstract We here establish the higher fractional differentiability for solutions to a class of obstacle problems with non-standard growth conditions. We deal with the case in which the solutions to the obstacle problems satisfy a variational inequality of the form ∫ Ω ⟨ A ⁢ ( x , D ⁢ u ) , D ⁢ ( φ - u ) ⟩ ⁢ d x ≥ 0 for all ⁢ φ ∈ K ψ ⁢ ( Ω ) , \int_{\Omega}\langle\mathcal{A}(x,Du),D(\varphi-u)\rangle\,dx\geq 0\quad\text{for all}\ \varphi\in\mathcal{K}_{\psi}(\Omega), where Ω is a bounded open subset of R n \mathbb{R}^{n} , ψ ∈ W 1 , p ⁢ ( Ω ) \psi\in W^{1,p}(\Omega) is a fixed function called obstacle and K ψ ⁢ ( Ω ) = { w ∈ W 1 , p ⁢ ( Ω ) : w ≥ ψ ⁢ a.e. in ⁢ Ω } \mathcal{K}_{\psi}(\Omega)=\{w\in W^{1,p}(\Omega):w\geq\psi\ \text{a.e. in}\ \Omega\} is the class of admissible functions. Assuming that the gradient of the obstacle belongs to some suitable Besov space, we are able to prove that some fractional differentiability property transfers to the gradient of the solution.

Highlights

  • The aim of this paper is the study of the higher fractional differentiability properties of the gradient of solutions u ∈ W1,p(Ω) to obstacle problems of the form min{∫ F(x, Dw) dx : w ∈ Kψ(Ω)}, Ω

  • In the case of standard growth conditions, Eleuteri and Passarelli di Napoli [20] proved that an extra differentiability of integer or fractional order of the gradient of the obstacle transfers to the gradient of the solutions, provided the partial map x 󳨃→ A(x, ξ ) possesses a suitable differentiability property

  • We remark that double phase elliptic obstacle problems can be obtained as a particular case of a functional satisfying our growth hypotheses; the assumption made in [45] on the coefficients of the operator A is stronger with respect to ours

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Summary

Introduction

The aim of this paper is the study of the higher fractional differentiability properties of the gradient of solutions u ∈ W1,p(Ω) to obstacle problems of the form min{∫ F(x, Dw) dx : w ∈ Kψ(Ω)}, where Ω is a bounded open set of Rn, n ≥ 2. In the case of standard growth conditions, Eleuteri and Passarelli di Napoli [20] proved that an extra differentiability of integer or fractional order of the gradient of the obstacle transfers to the gradient of the solutions, provided the partial map x 󳨃→ A(x, ξ ) possesses a suitable differentiability property. We remark that double phase elliptic obstacle problems can be obtained as a particular case of a functional satisfying our growth hypotheses; the assumption made in [45] on the coefficients of the operator A is stronger with respect to ours. After recalling some notation and preliminary results, we concentrate on proving our main results, Theorems 1.1 and 1.2 In both cases, the strategy is to establish the a priori estimate for an approximating solution and pass to the limit in the approximating problem.

Notation and preliminary results
Besov–Lipschitz spaces
Difference quotient
Preliminary results on standard growth conditions
Approximation results
A priori estimate
Passage to the limit
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