Transmission permutations and Demazure products in Hurwitz--Brill--Noether theory

TL;DR

This paper introduces transmission permutations in Hurwitz--Brill--Noether theory, showing their composition via Demazure products and deriving classical dimension bounds through permutation analysis.

Contribution

It establishes a new framework linking transmission permutations with Demazure products to unify classical and Hurwitz--Brill--Noether theory.

Findings

Transmission permutations compose via Demazure products.

Dimension bounds are derived using permutation decompositions.

Unified approach applies to both classical and Hurwitz--Brill--Noether theory.

Abstract

A line bundle on a curve with two marked points can be special in many ways, as measured by the global sections of all of its twists by these points. All of this information is conveniently packaged into a permutation, which we call the transmission permutation. We prove that when twice-marked curves are chained together, these permutations are composed via the Demazure product; in reverse, bundles with given permutation can be enumerated via reduced decompositions of a permutation. This paper demonstrates the utility of transmission permutations by giving a short derivation of the basic dimension bounds of both classical Brill--Noether theory and Hurwitz--Brill--Noether theory in a unified framework. The difference between the two cases derives from taking permutations in either symmetric groups or affine symmetric groups.