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arXiv · 2504.18895

$H^\infty$-calculus for the Stokes operator with Hodge, Navier, and Robin boundary conditions on unbounded domains

Peer Christian Kunstmann
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Abstract

We study the Stokes operator with Hodge, Navier, and Robin boundary conditions on domains $\Omega\subseteq\mathbb{R}^d$ that are uniformly $C^{2,1}$. Starting with the Hodge Laplacian we etablish a bounded H\"ormander functional calculus for the Stokes operator with Hodge boundary conditions. This entails a H\"ormander functional calculus and boundedness of the $H^\infty$-calculus in spaces of soleniodal vector fields for the Stokes operator with Hodge boundary conditions. We then establish boundedness of the $H^\infty$-calculus for Stokes operators with Navier type conditions via Robin type perturbations of Hodge boundary conditions. This implies maximal $L^p$-regularity for these operators and results on fractional domain spaces. Our results cover certain non-Helmholtz domains.

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Peer Christian Kunstmann. 2025-04-26. $H^\infty$-calculus for the Stokes operator with Hodge, Navier, and Robin boundary conditions on unbounded domains. https://arxiv.org/abs/2504.18895

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