Relative entropies for convex bodies

Details Relative entropies for convex bodies Relative entropies for convex bodies

2011-05-13

arxiv.org/abs/1105.2846v1

Mathematics

Functional Analysis

Scientific paper

We introduce a new class of (not necessarily convex) bodies and show, among other things, that these bodies provide yet another link between convex geometric analysis and information theory. Namely, they give geometric interpretations of the relative entropy of the cone measures of a convex body and its polar and related quantities. Such interpretations were first given by Paouris and Werner for symmetric convex bodies in the context of the $L_p$-centroid bodies. There, the relative entropies appear after performing second order expansions of certain expressions. Now, no symmetry assumptions are needed. Moreover, using the new bodies, already first order expansions make the relative entropies appear. Thus, these bodies detect "faster" details of the boundary of a convex body than the $L_p$-centroid bodies.

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