Shape optimization under minimal width and constant width constraints

Abstract

In this paper we study shape optimization problems for planar convex sets with prescribed minimal width or constant width. We prove that the Reuleaux triangle minimizes torsional rigidity among sets of constant width. We also show that the first Dirichlet-Laplace eigenvalue is maximized by the equilateral triangle under a minimal width constraint and by the Reuleaux triangle under a constant width constraint. The proofs use subsets consisting of a disk and three straight or circular caps. Reflection arguments reduce the study to equilateral configurations, which contain a polygon or a disk polygon depending on one parameter. The same cap constructions give a common proof of the known area, Cheeger and inner parallel area inequalities, and yield sharp bounds for all positive moments of the distance to the boundary. We also prove sharp inequalities for concentric disk intersections and decreasing radial integrals, and compare interaction energies for kernels close to a positive constant. This includes a nonempty interval of positive Riesz exponents. Finally, we investigate whether inclusion monotonicity and Minkowski concavity suffice to obtain these comparisons for other functionals.

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BibTeX RIS

BibTeX

@misc{bogosel2026shape,
  title = {{Shape optimization under minimal width and constant width constraints}},
  author = {Beniamin Bogosel},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.36382},
  eprint = {2610.36382},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.36382},
}

RIS

TY  - UNPB
TI  - Shape optimization under minimal width and constant width constraints
AU  - Beniamin Bogosel
PY  - 2026
DA  - 2026/10/26
PB  - arXiv
DO  - 10.48550/arxiv.2610.36382
UR  - https://arxiv.org/abs/2610.36382
AB  - In this paper we study shape optimization problems for planar convex sets with prescribed minimal width or constant width. We prove that the Reuleaux triangle minimizes torsional rigidity among sets of constant width. We also show that the first Dirichlet-Laplace eigenvalue is maximized by the equilateral triangle under a minimal width constraint and by the Reuleaux triangle under a constant width constraint. The proofs use subsets consisting of a disk and three straight or circular caps. Reflection arguments reduce the study to equilateral configurations, which contain a polygon or a disk polygon depending on one parameter. The same cap constructions give a common proof of the known area, Cheeger and inner parallel area inequalities, and yield sharp bounds for all positive moments of the distance to the boundary. We also prove sharp inequalities for concentric disk intersections and decreasing radial integrals, and compare interaction energies for kernels close to a positive constant. This includes a nonempty interval of positive Riesz exponents. Finally, we investigate whether inclusion monotonicity and Minkowski concavity suffice to obtain these comparisons for other functionals.
ER  -

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