Relative entropy of cone measures and L-p centroid bodies
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abstract
Let K be a convex body in n. We introduce a new affine invariant, which we call K, that can be found in three different ways: as a limit of normalized L p-affine surface areas;as the relative entropy of the cone measure of K and the cone measure of K;as the limit of the volume difference of K and L p-centroid bodies. We investigate properties of K and of related new invariant quantities. In particular, we show new affine isoperimetric inequalities and we show an 'information inequality' for convex bodies. 2011 London Mathematical Society.