XLII Workshop on Geometric Methods in Physics 30.06–5.07.2025 XIV School on Geometry and Physics 23–27.06.2025

Bartosz Kwaśniewski


Topological freeness and ideals in twisted Banach algebra crossed products


We generalize some fundamental C*-algebraic result for crossed products of discrete transformation groups to the realm of Banach algebras and twisted
actions. We show that topological freeness is equivalent to the
intersection property for all reduced twisted Banach algebra crossed
products coming from subgroups, and in the untwisted case to a generalized
intersection property for a full Lp-operator algebra crossed product.
This gives efficient simplicity criteria for various Banach algebra crossed products.

This talk is based on a joint work with Krzysztof Bardadyn
Event sponsored by
University of Białystok
University of Białystok