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arXiv · 2511.02688

Two properties of optimisers for the reverse isoperimetric problem

Deniz M. Hamdy·Julian Scheuer
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Abstract

The reverse isoperimetric problem asks for existence and properties of bounded convex sets in a Riemannian manifold which maximise the perimeter under all those sets of fixed volume which roll freely in a ball of some given radius. If the boundary of the set is of class $C^{2}$, this amounts to a positive lower bound on the principal curvatures and in this class we prove that there are no $C^{2}$-maximisers of perimeter with prescribed volume. In addition, we prove that a given possibly non-$C^{2}$ maximiser has its smallest principal curvature constant in regions where it is of class $C^{2}$. We prove this result in the Euclidean, spherical and hyperbolic space.

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Deniz M. Hamdy, Julian Scheuer. 2026-07-02. Two properties of optimisers for the reverse isoperimetric problem. https://arxiv.org/abs/2511.02688

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