Maximal Brill-Noether loci

par Asher Auel (Dartmouth College)

jeudi 8 juin 2023, 10:30 → 11:30 Europe/Paris

salle 207 bâtiment 1R2 (Institut de Mathématiques de Toulouse)

Brill-Noether theory answers the question of whether a general curve of genus g admits a degree d map to projective space P^r.  A refined Brill-Noether theory hopes to answer the question of whether a "general" curve of genus g and degree d in P^r admits a a degree e map to P^s . In other words, we want to know about the relative position between Brill-Noether loci in the moduli space of curves. I'll explain a strategy for distinguishing Brill-Noether loci by studying the lifting of linear systems on curves in polarized K3 surfaces, which motivates a conjecture identifying the maximal Brill-Noether loci with respect to containment. Via an analysis of the stability of Lazarsfeld-Mukai bundles, we obtain new lifting results for linear systems of rank 3 which suffice to prove the maximal Brill-Noether loci conjecture in genus 9-19, 22, and 23. This is joint work with Richard Haburcak.