Invariants in noncommutative dynamics

DOI10.1016/J.JFA.2018.12.014zbMATH Open1433.46045arXiv1804.01434OpenAlexW2795378937MaRDI QIDQ2317982

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Publication date: 13 August 2019

Published in: (Search for Journal in Brave)

Abstract: When a compact quantum group $H$ coacts freely on unital $C^{*}$-algebras $A$ and $B$, the existence of equivariant maps $AoB$ may often be ruled out due to the incompatibility of some invariant. We examine the limitations of using invariants, both concretely and abstractly, to resolve the noncommutative Borsuk-Ulam conjectures of Baum-Dabrowski-Hajac. Among our results, we find that for certain finite-dimensional $H$, there can be no well-behaved invariant which solves the Type 1 conjecture for all free coactions of $H$. This claim is in stark contrast to the case when $H$ is finite-dimensional and abelian. In the same vein, it is possible for all iterated joins of $H$ to be cleft as comodules over the Hopf algebra associated to $H$. Finally, two commonly used invariants, the local-triviality dimension and the spectral count, may both change in a $heta$-deformation procedure.

Full work available at URL: https://arxiv.org/abs/1804.01434

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