5 papers
Growth conditions for topological freeness
Nazmul Alam, Joseph Gondek, Mehrdad Kalantar +1
Given a finitely generated group , a non-trivial element , and a minimal action on a compact space , with amenable neighb…
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…
Conjugacy co-amenability
Mehrdad Kalantar, Srivatsav Kunnawalkam Elayavalli
In this note we study a natural analytic property of inclusions of groups akin to co-amenability: the property of existence of a non-compactly supported invariant state for the con…
Retraction Theorems for Group Compactifications
Yair Hartman, Aranka Hrušková, Mehrdad Kalantar +1
We characterize group compactifications of discrete groups for which there exists an equivariant retraction onto the boundary. In particular, we prove an equivariant analogue of Br…
More examples of additivity violation of the regularized minimum output entropy in the commuting-operator setup
Mehrdad Kalantar, Homayoon Shobeiri
We generalize recent results of Collins and Youn (2022), presenting new classes of quantum channels violating the additivity of the regularized minimum output entropy in the commut…