Stefan Wagner

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math.OA2026

Noncommutative principal bundles and central extensions

Stefan Wagner

Motivated by the classical theory of spin structures, we develop a theory for lifting free C $^{*}$ -dynamical systems, a.k.a. noncommutative principal bundles, along central extension…

math.OA2026

Weak Centrality of unital C(X)-algebras

Bharat Talwar, Prahlad Vaidyanathan, Stefan Wagner

This paper establishes a fibrewise characterization of weak centrality for unital $C (X)$ -algebras whose defining homomorphism maps $C (X)$ onto the center: such an algebra is weakly…

math.OA2025

Saturated Fell bundles and their classification

NatÃ£ Machado, Stefan Wagner

We present a comprehensive classification theory for saturated Fell bundles over locally compact groups, utilizing data associated with their base group and unit fiber. This framew…

math.OA2024

Realizations of free actions via their fixed point algebras

Kay Schwieger, Stefan Wagner

Let $G$ be a compact group, let $B$ be a unital C $^{*}$ -algebra, and let $(A, G, I^\pm)$ be a free C $^{*}$ -dynamical system, in the sense of Ellwood, with fixed point al…