Algebraic intersection for translation sufaces in a family of Teichm\H{u}ller disks

Abstract

The setting is a square-tiled surface X. We study the quantity KVol, defined as the supremum over all pairs of closed curves, of their algebraic intersection divided by the product of their length, times the volume of X (so as to make it scaling-invariant). We give a hyperbolic-geometric construction to compute KVol in a family of Teichm\H{u}ller disks of square-tiled surfaces.