English

Norm-controlled inversion in weighted convolution algebras

Functional Analysis 2018-09-13 v1

Abstract

Let GG be a discrete group, let p1p\ge1, and let ω\omega be a weight on GG. Using the approach from [9], we provide sufficient conditions on a weight ω\omega for p(G,ω)\ell^p(G,\omega) to be a Banach algebra admitting a norm-controlled inversion in the reduced C^*-algebra of GG, namely Cr(G)C^*_r(G). We show that our results can be applied to various cases including locally finite groups as well as finitely generated groups of polynomial or intermediate growth and a natural class of weights on them. These weights are of the form of polynomial or certain subexponential functions. We also consider the non-discrete case and study the existence of norm-controlled inversion in B(L2(G))B(L^2(G)) for some related convolution algebras.

Keywords

Cite

@article{arxiv.1809.04097,
  title  = {Norm-controlled inversion in weighted convolution algebras},
  author = {Ebrahim Samei and Varvara Shepelska},
  journal= {arXiv preprint arXiv:1809.04097},
  year   = {2018}
}
R2 v1 2026-06-23T04:02:56.646Z