Stability of nets of quadrics in $\mathbb{P}^5$ and associated discriminants

Abstract

Let $S$ be a complete intersection surface defined by a net $Λ$ of quadrics in $\mathbb P^5$. In this paper we analyze GIT stability of nets of quadrics in $\mathbb P^5$ up to projective equivalence, and discuss some connections between a net of quadrics and the associated discriminant sextic curve. In particular, we prove that if $S$ is normal and the discriminant $Δ(S)$ of $S$ is stable then $Λ$ is stable. And we prove that if $S$ has the reduced discriminant and $Δ(S)$ is stable then $Λ$ is stable. Moreover, we prove that if $S$ has simple singularities then $Δ(S)$ has simple singularities.