Minkowski valuations under volume constraints

Abstract

We provide a description of the space of continuous and translation invariant Minkowski valuations $\Phi :{\mathcal{K}}^n\to {\mathcal{K}}^n$ for which there is an upper and a lower bound for the volume of $\Phi (K)$ in terms of the volume of the convex body $K$ itself. Although no invariance with respect to a group acting on the space of convex bodies is imposed, we prove that only two types of operators appear: a family of operators having only cylinders over $(n-1)$-dimensional convex bodies as images, and a second family consisting essentially of 1-homogeneous operators. Using this description, we give improvements of some known characterization results for the difference body.

New title. Entirely revised