Beurling-Fourier algebras on compact groups: spectral theory

Details Beurling-Fourier algebras on compact groups: spectral theory Beurling-Fourier algebras on compact groups: spectral theory

2011-03-21

arxiv.org/abs/1103.4063v1

Mathematics

Functional Analysis

37 pages

Scientific paper

For a compact group $G$ we define the Beurling-Fourier algebra $A_\omega(G)$ on $G$ for weights $\omega$ defined on the dual $\what G$ and taking positive values. The classical Fourier algebra corresponds to the case $\omega$ is the constant weight 1. We study the Gelfand spectrum of the algebra realizing it as a subset of the complexification $G_{\mathbb C}$ defined by McKennon and Cartwright and McMullen. In many cases, such as for polynomial weights, the spectrum is simply $G$. We discuss the questions when the algebra $A_\omega(G)$ is symmetric and regular. We also obtain various results concerning spectral synthesis for $A_\omega(G)$.

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