Period integrals of hypersurfaces via tropical geometry

Abstract

Let ${\left\{Z_t\right\}}_t$ be a one-parameter family of complex hypersurfaces of dimension $d\ge 1$ in a toric variety. We compute asymptotics of period integrals for ${\left\{Z_t\right\}}_t$ by applying the method of Abouzaid--Ganatra--Iritani--Sheridan, which uses tropical geometry. As integrands, we consider Poincaré residues of meromorphic $(d+1)$-forms on the ambient toric variety, which have poles along the hypersurface $Z_t$. The cycles over which we integrate them are spheres and tori which correspond to tropical $(0,d)$-cycles and $(d,0)$-cycles on the tropicalization of ${\left\{Z_t\right\}}_t$ respectively. In the case of $d=1$, we explicitly write down the polarized logarithmic Hodge structure of Kato--Usui at the limit as a corollary. Throughout this article, we impose the assumption that the tropicalization is dual to a unimodular triangulation of the Newton polytope.

34 pages, 4 figure. v2: revised following the suggestions by the referees