Mutation Sequences along Weaves and Amalgamation of Braid Varieties

Abstract

Let $p,q$ be positive braids with Demazure products $u,v$. The endpoint stratum $\mathrm{Conf}(p,q{)}_{u,v}$ of the double Bott-Samelson cell splits as $\mathrm{Conf}(u,v)\times X(p)\times X(q^{\mathrm{op}})$, a double Bruhat cell times two braid varieties. We prove that the stratum's cluster structure is given by a cluster localization of the one on $\mathrm{Conf}(p,q)$, and that the splitting map is a quasi-cluster isomorphism. This comes from a mutation sequence along a double Demazure weave, one mutation per trivalent vertex, ending at an amalgamation of an extension of the double word quiver with the weave quiver. In the half-decorated case, this proves the conjecture of Gorsky-Kim-Scroggin-Simental for the splicing map $X(p)\times X(\Delta \Delta )\to X(p\Delta )$, where $\Delta$ is a reduced positive braid for $w_0$ and $\mathrm{dem}(p)=w_0$.

arXiv comment45 pages