A Stably Irrational (2,3)-Complete Intersection Fourfold over $\mathbb{Q}$

Abstract

We apply the specialization technique based on the decomposition of the diagonal to find an explicit example over $\mathbb{Q}$ of a quadric and cubic hypersurface in ${\mathbb{P}}^6$ such that their intersection is a smooth stably irrational fourfold. Using the same degeneration, Nicaise and Ottem have already proven that the the very general complete intersection of this type is stably irrational using the motivic volume.

13 pages, comments welcome

References in corpus (1)

• Unirational threefolds with no universal codimension 2 cycle