Abstract
We consider the problem of geometric optimisation of the lowest eigenvalue of the Laplacian in the exterior of a compact set in any dimension, subject to attractive Robin boundary conditions. As an improvement upon our previous work (Krejčiřík and Lotoreichik J. Convex Anal. 25, 319–337, 2018), we show that under either a constraint of fixed perimeter or area, the maximiser within the class of exteriors of simply connected planar sets is always the exterior of a disk, without the need of convexity assumption. Moreover, we generalise the result to disconnected compact planar sets. Namely, we prove that under a constraint of fixed average value of the perimeter over all the connected components, the maximiser within the class of disconnected compact planar sets, consisting of finitely many simply connected components, is again a disk. In higher dimensions, we prove a completely new result that the lowest point in the spectrum is maximised by the exterior of a ball among all sets exterior to bounded convex sets satisfying a constraint on the integral of a dimensional power of the mean curvature of their boundaries. Furthermore, it follows that the critical coupling at which the lowest point in the spectrum becomes a discrete eigenvalue emerging from the essential spectrum is minimised under the same constraint by the critical coupling for the exterior of a ball.
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Acknowledgments
The research of D.K. was partially supported by the grant No. 18-08835S of the Czech Science Foundation (GAČR) and by FCT (Portugal) through project PTDC/MAT-CAL/4334/2014. The research of V.L. was supported by the grant No. 17-01706S of the Czech Science Foundation (GAČR).
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Krejčiřík, D., Lotoreichik, V. Optimisation of the Lowest Robin Eigenvalue in the Exterior of a Compact Set, II: Non-Convex Domains and Higher Dimensions. Potential Anal 52, 601–614 (2020). https://doi.org/10.1007/s11118-018-9752-0
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DOI: https://doi.org/10.1007/s11118-018-9752-0
Keywords
- Robin Laplacian
- Negative boundary parameter
- Exterior of a compact set
- Lowest eigenvalue
- Spectral isoperimetric inequality
- Spectral isochoric inequality
- Parallel coordinates
- Critical coupling
- Willmore energy