Codimension of Brill-Noether Loci on Abelian Surfaces and the First Segre Invariant

Source abstract

Let $X$ be an abelian surface of Picard rank 1 with ample generator $H$. We show that, for a Mukai vector $\mathbf{v}=(r,mH,χ)$ with $r,m\geq 1$ and $χ\leq 0$, the first Brill-Noether loci $\{E \;|\; H^0(E)\neq 0\}$ in $M_X(\mathbf{v})$ is nonempty of the expected codimension $1-χ$. As an application, we study the rank 1 Segre invariant on these abelian surfaces. Specifically, for $\mathbf{v}$ a Mukai vector of a $μ$-stable sheaf of $\mathrm{rank}\geq 2$, we compute the Segre invariant of the general sheaf in $M_X(\mathbf{v})$, and we determine the numbers which arise as the Segre invariant of a sheaf in $M_X(\mathbf{v})$.