Fourier series on compact symmetric spaces

Details Fourier series on compact symmetric spaces Fourier series on compact symmetric spaces

2008-04-23

arxiv.org/abs/0804.3759v3

Mathematics

Representation Theory

New title and minor changes

Scientific paper

The Fourier coefficients F(t) of a function f on a compact symmetric space U/K are given by integration of f against matrix coefficients of irreducible representations of U. The coefficients depend on a spectral parameter t, which determines the representation, and they can be represented by elements F(t) in a common Hilbert space H. We obtain a theorem of Paley-Wiener type which describes the size of the support of f by means of the exponential type of a holomorphic H-valued extension of F, provided f is K-finite and of sufficiently small support. The result was obtained previously for K-invariant functions, to which case we reduce.

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