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Boundary regularity for the distance functions, and the eikonal equation

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arxiv 2409.01774 v2 pith:T6EV47LH submitted 2024-09-03 math.AP math.CV

classification math.APmath.CV
keywords boundarydistanceregularitydifferentiabledomaineikonalequationfunction
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abstract

We study the gain in regularity of the distance to the boundary of a domain in $\mathbb R^m$. In particular, we show that if the signed distance function happens to be merely differentiable in a neighborhood of a boundary point, it and the boundary have to be $\mathcal C^{1,1}$ regular. Conversely, we study the regularity of the distance function under regularity hypotheses of the boundary. Along the way, we point out that any solution to the eikonal equation, differentiable everywhere in a domain of the Euclidean space, admits a gradient which is locally Lipschitz.

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  1. Optimal bounds for the Kobayashi distance near $\mathcal C^2$-smooth boundary points

    math.CV 2025-06 conditional novelty 6.0 of 10

    The optimal Kobayashi-distance bounds previously known for C^{2,alpha}-smooth strongly pseudoconvex domains are proved for general C^2 strongly pseudoconvex domains, and upper bounds are extended to C^{1,1} and to non...

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