Constrained convex bodies with extremal affine surface areas
Abstract
Given a convex body K in R^n and p in R, we introduce and study the extremal inner and outer affine surface areas IS_p(K) = sup_{K'\subseteq K} (as_p(K') ) and os_p(K)=inf_{K'\supseteq K} (as_p(K') ), where as_p(K') denotes the L_paffine surface area of K', and the supremum is taken over all convex subsets of K and the infimum over all convex compact subsets containing K. The convex body that realizes IS_1(K) in dimension 2 was determined by Barany. He also showed that this body is the limit shape of lattice polytopes in K. In higher dimensions no results are known about the extremal bodies. We use a thin shell estimate of Guedon and Milman and the Löwner ellipsoid to give asymptotic estimates on the size of IS_p(K) and os_p(K). Surprisingly, both quantities are proportional to a power of volume.
 Publication:

arXiv eprints
 Pub Date:
 August 2019
 DOI:
 10.48550/arXiv.1908.07897
 arXiv:
 arXiv:1908.07897
 Bibcode:
 2019arXiv190807897G
 Keywords:

 Mathematics  Functional Analysis