Published Paper

Inserted: 16 jun 2022
Last Updated: 29 jun 2023

Journal: CalcVar PDE
Volume: 62
Pages: 33
Year: 2023
Doi: 10.1007/s00526-023-02522-6

Abstract:

We characterise all linear maps $\mathcal{A}\colon\mathbb{R}^{n\times n}\to\mathbb{R}^{n\times n}$ such that, for $1\leq p<n$, $ |P|_{L^{p^{*}}(\mathbb{R}^{n})}\leq c\,\big(|\mathcal{A}[P]|_{L^{p^{*}}(\mathbb{R}^{n})}+|\mathrm{Curl}\, P|_{L^{p}(\mathbb{R}^{n})} \big) $ holds for all compactly supported $P\in C_{c}^{\infty}(\mathbb{R}^{n};\mathbb{R}^{n\times n})$, where $\mathrm{Curl}\, P$ displays the matrix curl. Being applicable to incompatible, that is, non-gradient matrix fields as well, such inequalities generalise the usual Korn-type inequalities used e.g. in linear elasticity. Different from previous contributions, the results gathered in this paper are applicable to all dimensions and optimal. This particularly necessitates the distinction of different constellations between the ellipticities of $\mathcal{A}$, the integrability $p$ and the underlying space dimensions $n$, especially requiring a finer analysis in the two-dimensional situation.

Keywords: Korn Inequalities, Sobolev inequalities, incompatible tensor fields, limiting L^1-estimates.

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