Abstract
We prove that finite perimeter subsets of \(\mathbb {R}^{n+1}\) with small isoperimetric deficit have n-dimensional boundary Hausdorff-close to a sphere up to a subset of small measure. We also refine this closeness under some additional a priori \(L_p\)-norm mean curvature bounds for \(p\in [n-1,n]\). As an application, we answer a question raised by B. Colbois concerning the almost extremal hypersurfaces for Chavel’s inequality.
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Aubry, E., Grosjean, JF. On the boundary of almost isoperimetric domains. Math. Z. 297, 399–427 (2021). https://doi.org/10.1007/s00209-020-02515-7
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DOI: https://doi.org/10.1007/s00209-020-02515-7