Correction factors for Kac–Moody groups and t-deformed root multiplicities

Muthiah, D. , Puskás, A. and Whitehead, I. (2020) Correction factors for Kac–Moody groups and t-deformed root multiplicities. Mathematische Zeitschrift, 296(1-2), pp. 127-145. (doi: 10.1007/s00209-019-02419-1)

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 .

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Muthiah, Dr Dinakar and Puskas, Dr Anna
• Authors: Muthiah, D., Puskás, A., and Whitehead, I.
• College/School: College of Science and Engineering > School of Mathematics and Statistics > Mathematics
• Journal Name: Mathematische Zeitschrift
• Publisher: Springer
• ISSN: 0025-5874
• ISSN (Online): 1432-1823
• Published Online: 21 November 2019