Polarized 3-folds in a codimension 10 weighted homogeneous $F_4$ variety

Abstract

We give the construction of a codimension 10 weighted homogeneous variety $w\Sigma F_4(\mu,u)$ corresponding to the exceptional Lie group $F_4$ by explicit computation of its graded ring structure. We give a formula for the Hilbert series of the generic weighted $w\Sigma F_4(\mu,u)$ in terms of representation theoretic data of $F_4$. We also construct some families of polarized 3-folds in codimension 10 whose general member is the weighted complete intersection of some $w\Sigma F_4(\mu,u)$.