Continuous crystal and Duistermaat-Heckman measure for Coxeter groups

Philippe Biane, Philippe Bougerol*, Neil O'Connell

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

20 Citations (Scopus)

Abstract

We introduce a notion of continuous crystal analogous, for general Coxeter groups, to the combinatorial crystals introduced by Kashiwara in representation theory of Lie algebras. We explore their main properties in the case of finite Coxeter groups, where we use a generalization of the Littelmann path model to show the existence of the crystals. We introduce a remarkable measure, analogous to the Duistermaat-Heckman measure, which we interpret in terms of Brownian motion. We also show that the Littelmann path operators can be derived from simple considerations on Sturm-Liouville equations.

Original languageEnglish
Pages (from-to)1522-1583
Number of pages62
JournalAdvances in Mathematics
Volume221
Issue number5
DOIs
Publication statusPublished - 1 Aug 2009

Keywords

  • Brownian motion
  • Coxeter groups
  • Representation theory

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