Variable exponent Bochner-Lebesgue spaces with symmetric gradient structure

A. Kaltenbach; R. Růžička

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arXiv · 2010.05745

Variable exponent Bochner-Lebesgue spaces with symmetric gradient structure

A. Kaltenbach·R. Růžička

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Abstract

We introduce function spaces for the treatment of non-linear parabolic equations with variable $\log$-H\"older continuous exponents, which only incorporate information of the symmetric part of a gradient. As an analogue of Korn's inequality for these functions spaces is not available, the construction of an appropriate smoothing method proves itself to be difficult. To this end, we prove a point-wise Poincar\'e inequality near the boundary of a bounded Lipschitz domain involving only the symmetric gradient. Using this inequality, we construct a smoothing operator with convenient properties. In particular, this smoothing operator leads to several density results, and therefore to a generalized formula of integration by parts with respect to time. Using this formula and the theory of maximal monotone operators, we prove an abstract existence result.

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A. Kaltenbach, R. Růžička. 2020-10-12. Variable exponent Bochner-Lebesgue spaces with symmetric gradient structure. https://arxiv.org/abs/2010.05745

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