The Very General Verra Fourfold is Irrational

We show that the very general Verra fourfold is irrational, using the Hodge atom framework of Katzarkov–Kontsevich–Pantev–Yu. Two novel points are: a refined analysis of Hodge atoms, based on the involution on the cohomology of $X$, and a derivation of the quantum multiplication matrix from the quantum differential operator. This gives the first successful application of the method of Hodge atoms to a space with Picard rank greater than one.