English

Convex bodies with centrally symmetric sections

Metric Geometry 2025-11-21 v2

Abstract

Let KRnK\subset \mathbb{R}^n be a convex body, n3n\geq 3. We say that KK satisfies the Barker-Larman condition if there exists a ball BB in the interior of KK such that for every suppor hyperplane Π\Pi of BB, the section ΠK\Pi \cap K is a centrally symmetric set. Barker and Larman conjectured that the Barker-Larman condition characterizes the ellipsoid. In this work we prove an special case of such conjecture, in particular, we assume that the convex body KK is centrally symmetric. Our main result is the following: Let KK be a centrally symmetric and strictly convex body, with center at OO, and let BB be a ball in the interior of KK and not containing OO: If KK satisfies the Barker-Larman condition with respect to BB and BB is suitable for KK (intuitively, BB is suitable for KK if the boundary of BB is not very close to the boundary of KK), then KK is an ellipsoid.

Keywords

Cite

@article{arxiv.2307.07624,
  title  = {Convex bodies with centrally symmetric sections},
  author = {E. Morales-Amaya},
  journal= {arXiv preprint arXiv:2307.07624},
  year   = {2025}
}
R2 v1 2026-06-28T11:30:56.632Z