An identity of parabolic Kazhdan-Lusztig polynomials arising from square-irreducible modules

TL;DR

This paper derives explicit formulas for specific parabolic Kazhdan-Lusztig polynomials of the symmetric group, linking them to quantum group theory and confirming parts of recent conjectures.

Contribution

It provides a monomial formula for certain parabolic Kazhdan-Lusztig polynomials using quantum group techniques, connecting algebraic and combinatorial structures.

Findings

Explicit monomial formulas for parabolic Kazhdan-Lusztig polynomials

Connections established between these polynomials and quantum group canonical bases

Confirmation of some recent conjectures by Lapid

Abstract

We show a precise formula, in the form of a monomial, for certain families of parabolic Kazhdan-Lusztig polynomials of the symmetric group. The proof stems from results of Lapid-Minguez on irreducibility of products in the Bernstein-Zelevinski ring. By quantizing those results into a statement on quantum groups and their canonical bases, we obtain identities of coefficients of certain transition matrices that relate Kazhdan-Lusztig polynomials to their parabolic analogues. This affirms some basic cases of conjectures raised recently by Lapid.