Local Numerical Equivalences and Okounkov Bodies in Higher Dimensions

Abstract

We continue to explore the numerical nature of the Okounkov bodies focusing on the local behaviors near given points. More precisely, we show that the set of Okounkov bodies of a pseudoeffective divisor with respect to admissible flags centered at a fixed point determines the local numerical equivalence class of divisors, which is defined in terms of refined divisorial Zariski decompositions. Our results extend Roe's work [R] on surfaces to higher-dimensional varieties although our proof is essentially different in nature.