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arXiv 2406.09583math.APmath.CA
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具有动态边界条件的散度型算子的有界泛函演算

Bounded functional calculus for divergence form operators with dynamical boundary conditions

Tim Böhnlein, Moritz Egert, Joachim Rehberg

AI总结:

本文研究带动态边界条件的复系数散度型算子,通过扩展 Nittka 压缩判据与 Carbonaro-Dragičević 非线性热流方法,证明其在 p-适配椭圆性条件下于 L^p 上具有有界 H^∞-演算。

摘要:

我们考虑欧几里得空间中一个开子集上具有复系数的散度型算子。相应抛物问题中的边界条件是动态的,即时间导数出现在边界上。事实上,椭圆算子及其半群同时在内部和边界上作用。我们证明,如果系数满足 p-适配椭圆性条件,则该椭圆算子在 L^p 中具有有界的 H^∞-演算。证明中的一个主要挑战是算子空间域的不同部分具有不同的维度。我们的策略依赖于将 Nittka 提出的一个压缩性判据以及 Carbonaro-Dragičević 最近推广的非线性热流方法扩展到我们的情形。

英文摘要:

We consider divergence form operators with complex coefficients on an open subset of Euclidean space. Boundary conditions in the corresponding parabolic problem are dynamical, that is, the time derivative appears on the boundary. As a matter of fact, the elliptic operator and its semigroup act simultaneously in the interior and on the boundary. We show that the elliptic operator has a bounded $\mathrm{H}^\infty$-calculus in $\mathrm{L}^p$ if the coefficients satisfy a $p$-adapted ellipticity condition. A major challenge in the proof is that different parts of the spatial domain of the operator have different dimensions. Our strategy relies on extending a contractivity criterion due to Nittka and a non-linear heat flow method recently popularized by Carbonaro-Dragičević to our setting.

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