The noncommutative Borsuk–Ulam conjecture for equivariant joins

Let G\mathbb{G} be a compact quantum group. The nn-fold equivariant noncommutative join is denoted by C(EnΔG)C(E^\Delta_n\mathbb{G}), and dimLTG\dim_{\rm LT}^{\mathbb{G}} denotes the local-triviality dimension of a G\mathbb{G}-algebra.

Noncommutative Borsuk–Ulam conjecture. There does not exist a G\mathbb{G}-equivariant *-homomorphism

C(EnΔG)C(En+1ΔG)C(E^\Delta_n\mathbb{G})\to C(E^\Delta_{n+1}\mathbb{G})

and

dimLTG(C(EnΔG))=n.\dim_{\rm LT}^{\mathbb{G}}(C(E^\Delta_n\mathbb{G}))=n.

This conjecture generalizes the classical Borsuk–Ulam non-existence result from finite and compact Hausdorff groups to compact quantum groups, in the setting of iterated equivariant noncommutative joins. The supplied text gives no resolution of the conjecture.

Sources & referencesView supporting material

Primary source

Eusebio Gardella, Piotr M. Hajac, Mariusz Tobolski and Jianchao Wu, “The local-triviality dimension of actions of compact quantum groups”, arXiv:1801.00767 (2019).

Additional references

2 papers in this index state this conjecture (2015–2018). The statement above is taken from the most recent of them; the others are arXiv:1504.03588.

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