Steffen Polzer
Steffen Polzer
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I'm a mathematician working at the intersection of probability theory and mathematical physics. My research interests include models of matter-field interaction and their associated path measures, as well as the spectral theory of random graphs. I am currently a postdoctoral researcher at the Institute of Science and Technology Austria in the group of Robert Seiringer. In March 2026, I defended my PhD at the University of Geneva under the supervision of Antti Knowles. Before coming to Geneva, I studied mathematics and physics at the Technical University of Darmstadt, where I worked with Volker Betz.
Short CV
Short CV
Employment
Since 08/2026: Postdoctoral Researcher at the Institute of Science and Technology Austria
05/2026-07/2026: Postdoctoral Researcher at the University of Geneva
01/2022-04/2026: Doctoral Assistant at the University of Geneva
12/2020-12/2021: Research Assistant at the Technical University of Darmstadt
09/2015-09/2019: Student Assistant at the Technical University of Darmstadt
Education
2026: PhD in Mathematics, University of Geneva
2020: Master of Science in Mathematics, Technical University of Darmstadt
2018: Bachelor of Science in Mathematics, Technical University of Darmstadt
2018: Bachelor of Science in Physics, Technical University of Darmstadt
Publications and Preprints
Publications and Preprints
Lower bound on the energy-momentum relation of the polaron. Preprint on arXiv.
Wiener-Type Theorems for the Laplace Transform. With Applications to Ground State Problems, with Benjamin Hinrichs. Preprint on arXiv
On the Ising Phase Transition in the Infrared-Divergent Spin Boson Model, with Volker Betz, Benjamin Hinrichs and Mino Nicola Kraft. Preprint on arXiv
Renewal approach for the energy-momentum relation of the Fröhlich polaron. Letters in Mathematical Physics, 113, 90 (2023). https://doi.org/10.1007/s11005-023-01711-w
Effective Mass of the Polaron: A Lower Bound, with Volker Betz. Communications in Mathematical Physics, 399, 173–188 (2023). https://doi.org/10.1007/s00220-022-04553-0
A functional central limit theorem for Polaron path measures, with Volker Betz. Communications on Pure and Applied Mathematics, 75(11):2345–2392, (2022). https://doi.org/10.1002/cpa.22080
Talks
Talks
04/2026 Oberseminar Stochastik, TU-Darmstadt. Density of states of randomly sprinkled graphs
03/2026 A(E)MP Found Meeting, Apolda. Probabilistic approach to the effective mass
11/2025 MathPhys Analysis Seminar, Institute of Science and Technology Austria. Wiener-Type Theorems for the Laplace transform
06/2025 Complex Quantum Systems Seminar, Paderborn University. On the Existence and Non-Existence of Ground States in the Spin-Boson Model
03/2025 German Probability and Statistics Days, Dresden. Existence and Non-Existence of Ground States in the Spin-Boson Model
11/2024 CUSO Graduate Colloquium, Bern. Phase Transition in the Infrared-Divergent Spin-Boson Model
09/2023 LQP Workshop, Poznan. Renewal approach for the energy-momentum relation of the Fröhlich polaron.
06/2023 Rhein Main Kolloquium, Darmstadt. Renewal approach for the energy-momentum relation of the Fröhlich polaron.
03/2023 Mathematical Physics Seminar, University of Geneva. Renewal approach for the energy-momentum relation of the Polaron
12/2022 Mathematical Physics Seminar, University of Jena. Renewal approach for the energy-momentum relation of the Fröhlich polaron
11/2022 Mathematical Physics Seminar, University of Burgundy. Lower bound for the effective mass of the Fröhlich Polaron
08/2022 Quantissima in the Serenissima IV, Venice. Renewal Approach for the Energy-Momentum Relation of the Fröhlich Polaron
06/2022 MathPhys Analysis Seminar, Institute of Science and Technology Austria. Lower bound for the effective mass of the Polaron
09/2021 German Probability and Statistics Days, Mannheim. A functional central limit theorem for Polaron path measures
Teaching
Teaching
As a doctoral assistant at the University of Geneva
Probability: Introduction to Brownian motion, Large Deviations Theory
Analysis: Analysis 1, Analysis 2
Others: Introduction to Mathematical Programming, General Mathematics
As a student assistant at the Technical University of Darmstadt
Probability: Introduction to Stochastics
Analysis: Analysis 1, Analysis 2, Ordinary Differential Equations, Complex Analysis, Integration Theory, Functional Analysis
Contact
Contact
Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg, Austria
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