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math.OA2026
Stabilizer Subgroups and the Simplicity of Reduced Crossed Products
Yair Hartman, Mehrdad Kalantar
Given a minimal action of a countable group on a compact space , we prove that if the reduced crossed product is simple, then there ex…
math.OA2023
On the amenable subalgebras of group von Neumann algebras
Tattwamasi Amrutam, Yair Hartman, Hanna Oppelmayer
We approach the study of sub-von Neumann algebras of the group von Neumann algebra for countable groups from a dynamical perspective. It is shown that admits a maxi…
math.OA2021★ 1 cited
Tight inclusions of C*-dynamical systems
Yair Hartman, Mehrdad Kalantar
We study a notion of tight inclusions of C*- and W*-dynamical systems which is meant to capture a tension between topological and measurable rigidity of boundary actions. An import…