Moduli of sheaves supported on quartic space curves

TL;DR

This paper investigates the structure of the moduli space of stable sheaves on projective 3-space supported on quartic curves, revealing its three main components and their intersections through wall crossing techniques.

Contribution

It provides a detailed analysis of the moduli space's irreducible components, their intersections, and classifies stable sheaves via free resolutions, extending prior work on sheaves supported on quartic curves.

Findings

Identified three irreducible components of the moduli space.

Described intersections of these components.

Classified stable sheaves using free resolutions.

Abstract

As a continuation of the work of Freiermuth and Trautmann, we study the geometry of the moduli space of stable sheaves on $\mathbb{P}^3$ with Hilbert polynomial $4m+1$. The moduli space has three irreducible components whose generic elements are, respectively, sheaves supported on rational quartic curves, on elliptic quartic curves, or on planar quartic curves. The main idea of the proof is to relate the moduli space with the Hilbert scheme of curves by wall crossing. We present all stable sheaves contained in the intersections of the three irreducible components. We also classify stable sheaves by means of their free resolutions.