activity
20062026
most citedC*-simplicity and the unique trace property for discrete groups

85 citations · 215 across the 34 of their papers we have counts for

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31 papers · 1 filter

math.OA2026

Groups with rapid decay and trivial amenable radical are C*-simple

Caleb Barnett, Joseph Gondek, Mehrdad Kalantar

We prove that every finitely generated group with rapid decay and trivial amenable radical is C*-simple.

math.OA2026

Invariant random subgroups of -simple groups

Tattwamasi Amrutam, Mehrdad Kalantar

Let be a countable discrete -simple group. Let be a -invariant Borel probability measure on , i.e., an IRS. We show that -almost every subgroup $H…

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.OA2026

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…

math.OA2026

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 neighborh…

math.OA2025

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…