Monoidal Categorification and Quantization of Braid Varieties

Abstract

Let \(G\) be a simple and simply connected algebraic group of simply-laced type. For each positive braid word \(\beta\), and for the complete strong duality datum attached to a \(Q\)-datum, we construct an explicit based monoidal categorification of the quantum cluster algebra of the braid variety \(X(\beta)\). We identify this algebra with both a localized quantum Grothendieck ring and a localized level-\(\geq1\) subalgebra of the bosonic extension algebra. Under these identifications, quantum cluster monomials correspond simultaneously to real simple modules and normalized global basis elements. We construct the specialization homomorphism at \(q^{1/2}=1\) and prove that it recovers \(\CC[X(\beta)]\); in particular, the resulting integral form is a flat quantum deformation. We also give intrinsic Lusztig parameters for cluster variables attached to double strings, identify the corresponding quantum grid minors, and establish generalized quantum \(T\)-systems.