Equivariance implies admissibility for groupoid Busby homomorphisms
Let be a second countable groupoid, and be separable, --algebras, and let be a -homomorphism.
Equivariance-implies-admissibility conjecture. If is -equivariant, then is -admissible.
For locally compact, Hausdorff, second countable groups, the corresponding equivalence between -admissibility and -equivariance is established in the preceding corollary. The conjecture asks whether the converse implication remains valid for general second countable groupoids.
References
Primary source
Suvrajit Bhattacharjee and Marzieh Forough, “Quasi-invariant lifts of completely positive maps for groupoid actions”, arXiv:2405.07859 (2026).
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