English

Convergence of spectral truncations for compact metric groups

Operator Algebras 2023-10-24 v1

Abstract

We consider Gromov-Hausdorff convergence of state spaces for spectral truncations of a compact metric group GG. We work in the context of order-unit spaces and consider orthogonal projections PΛP_\Lambda in L2(G)L^2(G) corresponding to finite subsets of irreducible representations ΛG^\Lambda \subseteq \widehat G. We then prove that the sequence of truncated state spaces {S(PΛC(G)PΛ)}Λ\{ S(P_\Lambda C(G) P_\Lambda)\}_\Lambda Gromov-Hausdorff converges to the original state space S(C(G))S(C(G)), when these are equipped with a metric associated to a Lip-norm which in turn is induced by the action of GG.

Keywords

Cite

@article{arxiv.2310.14733,
  title  = {Convergence of spectral truncations for compact metric groups},
  author = {Yvann Gaudillot-Estrada and Walter D. van Suijlekom},
  journal= {arXiv preprint arXiv:2310.14733},
  year   = {2023}
}

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9 pages