Newton-Okounkov bodies, semigroups of integral points, graded algebras and intersection theory

Abstract

Generalizing the notion of Newton polytope, we define the Newton-Okounkov body, respectively, for semigroups of integral points, graded algebras, and linear series on varieties. We prove that any semigroup in the lattice Z^n is asymptotically approximated by the semigroup of all the points in a sublattice and lying in a convex cone. Applying this we obtain several results: we show that for a large class of graded algebras, the Hilbert functions have polynomial growth and their growth coefficients satisfy a Brunn-Minkowski type inequality. We prove analogues of Fujita approximation theorem for semigroups of integral points and graded algebras, which imply a generalization of this theorem for arbitrary linear series. Applications to intersection theory include a far-reaching generalization of the Kushnirenko theorem (from Newton polytope theory) and a new version of the Hodge inequality. We also give elementary proofs of the Alexandrov-Fenchel inequality in convex geometry and its analogue in algebraic geometry.

39 pages. Revised in several places and the title slightly modified. Final version, to appear in Annals of Mathematics

References in corpus (4)

• Convex bodies and algebraic equations on affine varieties
• Convex Bodies Associated to Linear Series
• Newton polytopes for horospherical spaces
• Transforming metrics on a line bundle to the Okounkov body

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