Geometry of genus one fine compactified universal Jacobians

TL;DR

This paper introduces a broad framework for fine compactified Jacobians of nodal curves, focusing on genus 1, and provides classification, construction, and cohomological results for these moduli spaces.

Contribution

It develops a general abstract notion of fine compactified Jacobians for genus 1 curves, classifies them combinatorially, and constructs new examples of universal Jacobians with explicit cohomological formulas.

Findings

Classification of genus 1 fine compactified Jacobians for single nodal curves.

Construction of new genus 1 fine compactified universal Jacobians.

Explicit formulas for Hodge and Betti numbers, with algebraic even cohomology.

Abstract

We introduce a general abstract notion of fine compactified Jacobian for nodal curves of arbitrary genus. We focus on genus 1 and prove combinatorial classification results for fine compactified Jacobians in the case of a single nodal curve and in the case of the universal family over the moduli space of stable pointed curves. We show that if the fine compactified Jacobian of a nodal curve of genus 1 can be extended to a smoothing of the curve, then it can be described as the moduli space of stable sheaves with respect to some polarisation. In the universal case we construct new examples of genus 1 fine compactified universal Jacobians. Then we give a formula for the Hodge and Betti numbers of each genus 1 fine compactified universal Jacobian and prove that their even cohomology is algebraic.