Cubic fourfolds with an involution

Marquand, Lisa

doi:10.1090/tran/8811

Cubic fourfolds with an involution
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Trans. Amer. Math. Soc. 376 (2023), 1373-1406 Request permission

Abstract:

There are three types of involutions on a cubic fourfold; two of anti-symplectic type, and one symplectic. Here we show that cubics with involutions exhibit the full range of behaviour in relation to rationality conjectures. Namely, we show a general cubic fourfold with a symplectic involution has no associated $K3$ surface and is conjecturely irrational. In contrast, a cubic fourfold with a particular anti-symplectic involution has an associated $K3$, and is in fact rational. We show such a cubic is contained in the intersection of all non-empty Hassett divisors; we call such a cubic Hassett maximal. We study the algebraic and transcendental lattices for cubics with an involution both lattice theoretically and geometrically.

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