The noncommutative Borsuk–Ulam conjecture for equivariant joins

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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 dim⁡LTG\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

dim⁡LTG(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.

References

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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