The Dual Orlicz-Brunn-Minkowski Theory

Abstract

This paper introduces the dual Orlicz-Brunn-Minkowski theory for star sets. A radial Orlicz addition of two or more star sets is proposed and a corresponding dual Orlicz-Brunn-Minkowski inequality is established. Based on a radial Orlicz linear combination of two star sets, a formula for the dual Orlicz mixed volume is derived and a corresponding dual Orlicz-Minkowski inequality proved. The inequalities proved yield as special cases the precise duals of the conjectured log-Brunn-Minkowski and log-Minkowski inequalities of Böröczky, Lutwak, Yang, and Zhang. A new addition of star sets called radial $M$-addition is also introduced and shown to relate to the radial Orlicz addition.

The present paper is a combination of a manuscript by the first three authors dated May 21, 2013, and the preprint arXiv:1404.6991 written independently by the fourth author. Special cases of some of the results in the present paper were obtained independently in Chapter 5 of the thesis of B. Zhu (see Appendix for a brief description of the difference between them)