A1 Refereed original research article in a scientific journal
Constrained maximization of conformal capacity
Authors: Hakula, Harri; Nasser, Mohamed M.S.; Vuorinen, Matti
Publisher: Elsevier BV
Publication year: 2025
Journal: Computers and Mathematics with Applications
Journal name in source: Computers & Mathematics with Applications
Volume: 193
First page : 132
Last page: 156
ISSN: 0898-1221
eISSN: 1873-7668
DOI: https://doi.org/10.1016/j.camwa.2025.05.021
Web address : https://doi.org/10.1016/j.camwa.2025.05.021
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/498467730
Preprint address: https://arxiv.org/abs/2404.19663v1
We consider constellations of disks which are unions of disjoint hyperbolic disks in the unit disk with fixed radii and unfixed centers. We study the problem of maximizing the conformal capacity of a constellation with a fixed number of disks under constraints on the centers in two cases. In the first case the constraint is that the centers are at most at distance 𝑅 ∈ (0, 1) from the origin and in the second case it is required that the centers are on the subsegment [−𝑅, 𝑅] of a diameter of the unit disk. We study also similar types of constellations with hyperbolic segments instead of the hyperbolic disks. Our computational experiments suggest that a dispersion phenomenon occurs: the disks/segments go as close to the unit circle as possible under these constraints and stay as far as possible from each other. The computation of capacity reduces to the Dirichlet problem for the Laplace equation which we solve using two methods: a fast boundary integral equation method and a high-order finite element method.
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