English

Banach manifolds of spectrally small quantum-group representations

Operator Algebras 2026-02-24 v1 Functional Analysis Quantum Algebra Representation Theory

Abstract

We prove that finite-spectrum representations of compact quantum groups either in unital CC^*-algebras AA or on Banach spaces EE exhibit the same Banach-space-modeled differential-geometric structure as their classical analogues: (a) they are Banach analytic manifolds; (b) locally homogeneous under conjugation by the pertinent Banach Lie group U(A)U(A) or GL(E)GL(E); (c) with orbit maps fibering principally; (d) and hence with said orbit maps admitting local analytic splitting. We also identify the finite-spectrum unitary representations as precisely those that are norm-continuous in the appropriate sense when the compact quantum group has at least one classical point, again generalizing the classical parallel present in various forms in work of Kallman, Shtern and the author.

Keywords

Cite

@article{arxiv.2602.18878,
  title  = {Banach manifolds of spectrally small quantum-group representations},
  author = {Alexandru Chirvasitu},
  journal= {arXiv preprint arXiv:2602.18878},
  year   = {2026}
}

Comments

12 pages + references