Spherical harmonic analysis on affine buildings

Details Spherical harmonic analysis on affine buildings Spherical harmonic analysis on affine buildings

2006-04-04

arxiv.org/abs/math/0604058v1

Mathematics

Functional Analysis

To appear in Mathematische Zeitschrift

Scientific paper

10.1007/s00209-005-0924-4

To each regular affine building there is naturally associated a commutative algebra A spanned by vertex set averaging operators. In this paper we study the algebra homomorphisms from A into the complex numbers. In particular, we provide two explicit formulae for these homomorphisms; one in terms of the Macdonald spherical functions, and another as an integral over the boundary of the building. We also determine the associated Plancherel measure, and we compute the l^2-operator norms of each basis element of A.

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