English

Irremediably singular quantum branched covers

Quantum Algebra 2026-05-26 v1 Algebraic Topology Functional Analysis Operator Algebras

Abstract

We prove that the Natsume-Olsen non-commutative spheres Sθ2n1\mathbb{S}^{2n-1}_{\theta} dualize for rational deformation parameters to provide examples of quantum branched covers over their respective centers' maximal spectra, embeddable into locally trivial CC^* bundles precisely when said spheres are classical; this, despite the bundles in question being of finite type over dimensional strata. The proof of the noted rigidity phenomenon relies on the quantum analogue of the 3-sphere's Heegaard splitting as a pushout of two solid tori.

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Cite

@article{arxiv.2605.24007,
  title  = {Irremediably singular quantum branched covers},
  author = {Alexandru Chirvasitu},
  journal= {arXiv preprint arXiv:2605.24007},
  year   = {2026}
}

Comments

9 pages + references