Differentiability of volumes of divisors and a problem of Teissier

Details Differentiability of volumes of divisors and a problem of Teissier Differentiability of volumes of divisors and a problem of Teissier

2006-08-10

arxiv.org/abs/math/0608260v2

Mathematics

Algebraic Geometry

28 pages. Final version. To appear in J. Alg. Geom

Scientific paper

We give an algebraic construction of the positive products of pseudo-effective classes first introduced by Boucksom, Demailly, Paun and Peternell, and use them to prove that the volume function on the Neron-Severi space of a projective variety is (once) differentiable. The differential is expressed as a positive product; we also relate it to the restricted volumes introduced by Ein et al and by Takayama. Then we apply our differentiability result to prove an algebro-geometric version of the Diskant inequality in convex geometry, allowing us to characterize the equality case of the Khovanskii-Teissier inequalities for nef and big classes.

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