Title

Correction Factors For Kac–Moody Groups And t-Deformed Root Multiplicities

Document Type

Article

Publication Date

11-21-2019

Published In

Mathematische Zeitschrift

Abstract

We study a correction factor for Kac–Moody root systems which arises in the theory of p-adic Kac–Moody groups. In affine type, this factor is known, and its explicit computation is the content of the Macdonald constant term conjecture. The data of the correction factor can be encoded as a collection of polynomials mλ∈Z[t] indexed by positive imaginary roots λ. At t=0 these polynomials evaluate to the root multiplicities, so we consider mλ to be a t-deformation of mult(λ). We generalize the Peterson algorithm and the Berman–Moody formula for root multiplicities to compute mλ. As a consequence we deduce fundamental properties of mλ.

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