On Calabi-Yau varieties that are linear sections of Grassmannians of lines

Source abstract

In this paper we consider the $n-3$ dimensional linear section $X_Π$ of the Grassmannian $\mathbb G(1,n)$ of lines in $\mathbb P^n$ with a general linear space $Π$ of codimension $n+1$, with $n=2k+1$ odd and $n\geq 5$, that is a Calabi-Yau variety. Related to $X_Π$ there is a degree $k+1$ Pfaffian hypersurface $\mathcal C_Π$ that is the intersection of the dual of $\mathbb G(1,n)$ with $Π^\perp$. We prove that $\mathcal C_Π$ is rational and we provide a birational parametrization of it. Moreover we study in some detail the congruence of lines of $\mathbb P^n$ given by the centers of the linear complexes parametrised by the points of $\mathcal C_Π$.