A skein action of the symmetric group on noncrossing partitions

TL;DR

This paper introduces a new symmetric group action on noncrossing partitions using skein relations, providing novel representation-theoretic proofs of cyclic sieving phenomena and generalizing classical relations.

Contribution

It defines a skein-based symmetric group action on noncrossing partitions and characterizes the resulting module, linking it to cyclic sieving and extending classical skein relations.

Findings

New symmetric group action on noncrossing partitions

Representation-theoretic proofs of cyclic sieving results

Generalization of Kauffman bracket relations

Abstract

We introduce and study a new action of the symmetric group $\mathfrak{S}_n$ on the vector space spanned by noncrossing partitions of $\{1, 2, \dots, n\}$ in which the adjacent transpositions $(i, i+1) \in \mathfrak{S}_n$ act on noncrossing partitions by means of skein relations. We characterize the isomorphism type of the resulting module and use it to obtain new representation theoretic proofs of cyclic sieving results due to Reiner-Stanton-White and Pechenik for the action of rotation on various classes of noncrossing partitions and the action of K-promotion on two-row rectangular increasing tableaux. Our skein relations generalize the Kauffman bracket (or Ptolemy relation) and can be used to resolve any set partition as a linear combination of noncrossing partitions in a $\mathfrak{S}_n$-equivariant way.