Stefan Wagner
Associate Professor/Prodean
Department of Mathematics and Natural Sciences
Room J3531, Karlskrona
Research domain: Mathematics and Applications
Follow me:
I am an associate professor in mathematics at the department of mathematics and natural sciences at BTH.
My research is centered on noncommutative geometry, with an emphasis on developing operator-algebraic models of geometric structures. A guiding theme is the noncommutative formulation of the principal-bundle framework of geometry using C*-algebraic methods. Complementing this analytic viewpoint, I study these constructions algebraically via graded structures—such as graded rings—and explore their connections with Fell bundles, graph C*-algebras, and groupoid C*-algebras.
Selected publications
- An Atiyah sequence for noncommutative principal bundles, SIGMA 18 (2022), 015, 22 pages
- Lifting spectral triples to noncommutative principal bundles, Adv. Math. 396 (2022), 108160
- Part I, Free actions of compact Abelian groups on C*-algebras, Adv. Math. 317 (2017), 224-266
- A geometric approach to noncommutative principal torus bundles, Proc. London Math. Soc. (2013) 106 (6), 1179-1222
Latest publications
- Nata Machado, Stefan Wagner, "Classification of saturated Fell bundles", Journal of Noncommutative Geometry, ISSN 1661-6952, EISSN 1661-6960, European Mathematical Society Publishing House, 2026
- Stefan Wagner, "On noncommutative frame bundles", New York Journal of Mathematics, EISSN 1076-9803, Vol. 31, pp. 837-856, Electronic journals project, University of Albany, 2025
- Kay Schwieger, Stefan Wagner, "Realizations of free actions via their fixed point algebras", Canadian mathematical bulletin, ISSN 0008-4395, Vol. 68, No. 2, pp. 568-581, Cambridge University Press, 2025
- Daniel Lännström, Patrik Lundström, Johan Öinert, Stefan Wagner, "Prime group graded rings with applications to partial crossed products and Leavitt path algebras", Journal of Pure and Applied Algebra, ISSN 0022-4049, EISSN 1873-1376, Vol. 229, No. 1, Elsevier, 2025
- Natã Machado, Johan Öinert, Stefan Wagner, "Non-Abelian Extensions of Groupoids and Their Groupoid Rings", Applied Categorical Structures, ISSN 0927-2852, EISSN 1572-9095, Vol. 33, No. 1, Springer Science+Business Media B.V., 2025
Current projects
No information available
Completed projects
No information available