English

$p$-Fourier algebras on compact groups

Functional Analysis 2015-02-18 v2 Operator Algebras

Abstract

Let GG be a compact group. For 1p1\leq p\leq\infty we introduce a class of Banach function algebras Ap(G)\mathrm{A}^p(G) on GG which are the Fourier algebras in the case p=1p=1, and for p=2p=2 are certain algebras discovered in \cite{forrestss1}. In the case p2p\not=2 we find that Ap(G)Ap(H)\mathrm{A}^p(G)\cong \mathrm{A}^p(H) if and only if GG and HH are isomorphic compact groups. These algebras admit natural operator space structures, and also weighted versions, which we call pp-Beurling-Fourier algebras. We study various amenability and operator amenability properties, Arens regularity and representability as operator algebras. For a connected Lie GG and p>1p>1, our techniques of estimation of when certain pp-Beurling-Fourier algebras are operator algebras rely more on the fine structure of GG, than in the case p=1p=1. We also study restrictions to subgroups. In the case that G=SU(2)G=SU(2), restrict to a torus and obtain some exotic algebras of Laurent series. We study amenability properties of these new algebras, as well.

Keywords

Cite

@article{arxiv.1411.2336,
  title  = {$p$-Fourier algebras on compact groups},
  author = {Hun Hee Lee and Ebrahim Samei and Nico Spronk},
  journal= {arXiv preprint arXiv:1411.2336},
  year   = {2015}
}

Comments

Introduction has been rewritten, 41 pages

R2 v1 2026-06-22T06:53:04.790Z