Hecke Algebra-valued Poincaré Series and Geometric Factorization of Affine Weyl Groups

Abstract

This paper studies affine Weyl groups through the geometry of geodesic tubes and their hyperbolic stabilizers. We introduce a geometric framework relating affine Weyl group factorizations to Hecke-algebra-valued Poincaré series and zeta functions on quotient complexes. Using this framework, we prove a conjecture describing the connection between geodesic tubes and factorizations of Poincaré series for affine Weyl groups. We also establish partial results toward a Hecke-algebra-valued zeta identity for simply connected groups, including the cases of types ${\tilde{A}}_{n-1}$ and ${\tilde{C}}_n$. These results highlight the interaction between affine Weyl group geometry, Hecke algebras, and zeta functions arising from Bruhat--Tits buildings.

arXiv comment35 pages. Accepted for publication in Journal of Group Theory. Corrected the definition and normalization of circular geodesic tube zeta functions, with corresponding proof amendments