Twisted Connes–Popa rigidity conjecture for ICC property (T) groups
Twisted Connes–Popa rigidity conjecture for ICC property (T) groups
Let be an ICC property (T) group, let be an arbitrary countable ICC group, and let and be -cocycles. For , suppose that
is a -isomorphism. Twisted Connes–Popa rigidity conjecture. Then , there is a group isomorphism such that is cohomologous to , and there exist a map , a multiplicative character , and a unitary satisfying
and
This is proposed as an extension of Popa's strengthening of Connes' rigidity conjecture to twisted group factors. The source gives preceding results supporting the formulation but does not state that it is resolved.
Progress summary
Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.
Sources & referencesView supporting material
Primary source
Ionuţ Chifan, Adriana Fernández Quero, Denis Osin and Hui Tan, “W^*-superrigidity for property (T) groups with infinite center”, arXiv:2503.12742 (2026).
Solutions 0
Sign in to submit a solution.
No solutions have been posted yet.