Address |
Mathematisches Institut, Universität Bonn Endenicher Allee 60 53115 Bonn Germany |
---|---|
Office | 4.006 |
lenz (at) math (dot) uni-bonn (dot) de | |
I’m a postdoc (Akademischer Rat auf Zeit) in the topology group at the University of Bonn. Before that I was a postdoc at the University of Utrecht (2022–2024) and at the University of Bonn (2021–2022), where I also obtained my PhD under the supervision of Stefan Schwede in 2021.
My research concerns various aspects of homotopy theory, and I am particularly interested in questions relating to (parametrized) higher category theory, (global) equivariant homotopy theory, algebraic K-theory, and the interactions between these subjects.
Normed Equivariant Ring Spectra and Higher Tambara Functors
joint with Bastiaan Cnossen, Rune Haugseng, and Sil Linskens
preprint, 64 pages
arXiv:2407.08399
Parametrized (Higher) Semiadditivity and the Universality of Spans
joint with Bastiaan Cnossen and Sil Linskens
preprint, 75 pages
arXiv:2403.07676
Homotopical Commutative Rings and Bispans
joint with Bastiaan Cnossen, Rune Haugseng, and Sil Linskens
preprint, 34 pages
arXiv:2403.06911
The Adams Isomorphism Revisited
joint with Bastiaan Cnossen and Sil Linskens
Math. Z. 308 No. 2 (2024), Paper No. 33, 32 pages
published version
arXiv:2311.04884
Simplicial *-Modules and Mild Actions
joint with Anna Marie Schröter
Homology Homotopy Appl. 26 No. 2 (2024), pp. 229–258
published version
arXiv version (arXiv:2307.11002)
Partial Parametrized Presentability and the Universal Property of Equivariant Spectra
joint with Bastiaan Cnossen and Sil Linskens
preprint, 56 pages
arXiv:2307.11001
Global Model Categories and Topological André-Quillen Cohomology
joint with Michael Stahlhauer
to appear in Trans. Amer. Math. Soc., 79 pages
arXiv:2302.06207
Parametrized Stability and the Universal Property of Global Spectra
joint with Bastiaan Cnossen and Sil Linskens
preprint, 110 pages
arXiv:2301.08240
Genuine Versus Naïve Symmetric Monoidal G-Categories
Doc. Math. 28 No. 5 (2023), pp. 1079–1161
published version
arXiv version (arXiv:2203.02277)
Global Algebraic K-Theory is Swan K-Theory
preprint, 53 pages
arXiv:2202.07272
Categorical Models of Unstable G-Global Homotopy Theory
Cah. Topol. Géom. Différ. Catég. 64 No. 4 (2023), pp. 439–481
published version
arXiv version (arXiv:2109.02067)
G-Global Homotopy Theory and Algebraic K-Theory
to appear in Mem. Amer. Math. Soc., v + 246 pages
arXiv:2012.12676
presentation (Junior Mathematician Research Archive)
On the Global Homotopy Theory of Symmetric Monoidal Categories
New York J. Math. 29 (2023), pp. 635–686
published version
arXiv version (arXiv:2009.07004)
Parsummable Categories as a Strictification of Symmetric Monoidal Categories
Theory Appl. Categ. 37 (2021), Paper No. 17, pp. 482–529
published version
arXiv version (arXiv:2006.15068)
Homotopy (Pre)Derivators of Cofibration Categories and Quasicategories
Algebr. Geom. Topol. 18 No. 6 (2018), pp. 3601–3646
published version (doi:10.2140/agt.2018.18.3601) arXiv version (arXiv:1712.07845)
Assistant for lecture Topology I
taught by Stefan Schwede
Assistant for lecture Einführung in die Algebra
taught by Gebhard Martin
Lecture course Bewijzen in de Wiskunde (Proofs in Mathematics)
with Johan Commelin, Mireia Martínez i Sellarès, Lennart Meier, Guido Terra-Bleeker, and Marieke van der Wegen
Lecture course Selected Topics in Topology: Homotopy Coherent Algebraic Structures
Seminar Topologische Anwendungen algebraischer K-Theorie (Applications of Algebraic K-Theory in Topology)
with Stefan Schwede
Together with Stefan Schwede I offer two topics for bachelor theses in the upcoming summer term.
You can find more information about them in these slides.
Both of these topics have been taken now.
Graduate seminar Lie Groups and Their Representations
with Stefan Schwede
Assistant for the lecture Topology I
taught by Daniel Kasprowski