The relative solidity conjecture for relatively hyperbolic groups
The relative solidity conjecture for relatively hyperbolic groups
Let be a group that is hyperbolic relative to a finite family of subgroups . Denote by the von Neumann algebra corresponding to . Let be a nonzero projection and let be a von Neumann subalgebra whose relative commutant has no amenable direct summand. Relative solidity conjecture. There is some such that a corner of intertwines into inside , in the sense of Popa; that is, . This concerns the structure of commuting subalgebras of group von Neumann algebras associated with relatively hyperbolic groups; the supplied text gives no resolution status for the conjecture.
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Primary source
Juan Felipe Ariza Mejia, Dulanji Nikethani Amaraweera, Ionut Chifan and Krishnendu Khan, “Relative solidity results and their applications to computations of some II_1 factor invariants”, arXiv:2509.19481 (2025).
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