Postdoc at the University of Bonn
I study p-adic reductive groups, their representation theory, and connections to the Langlands program.
Starting Fall 2025, I will be an assistant professor at the University of Utah.
schwein@math.uni-bonn.de • ORCID • MathOverflow • zbMATH • Wikipedia • Spectra
Construction of tame supercuspidal representations in arbitrary residue characteristic, with Jessica Fintzen
January 2025
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53 pages
Non-basic rigid packets for discrete L-parameters, with Peter Dillery
August 2024
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66 pages
A stacky generalized Springer correspondence and rigid enhancements of L-parameters, with Peter Dillery
August 2023
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66 pages
Orthogonal root numbers of tempered parameters
Mathematische Annalen
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August 2022
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37 pages
Formal degree of regular supercuspidals
Journal of the European Mathematical Society
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January 2024
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53 pages
New supercuspidal representations from the Weil representation in characteristic two
Institut Henri Poincaré • Representation Theory and Noncommutative Geometry •
March 2025
Nonbasic rigid packets for discrete L-parameters
Institut Henri Poincaré • Representation Theory and Noncommutative Geometry •
March 2025
New supercuspidal representations from the Weil representation in characteristic two
Utah • Representation Theory and Number Theory Seminar •
January 2025
Representations of p-adic groups: "elementary particles" and the "periodic table"
Utah • Departmental Colloquium •
January 2025
New supercuspidal representations from the Weil representation in characteristic two
Zagreb • Unitary Representations and Automorphic Forms Seminar •
January 2025
New supercuspidal representations from the Weil representation in characteristic two
Oberwolfach • Representations of p-adic groups •
December 2024
New supercuspidal representations from the Weil representation in characteristic two
Bonn • Arithmetic Geometry and Representation Theory Seminar •
November 2024
Non-basic rigid packets for discrete L-parameters
Tokyo •
Workshop on Shimura varieties, representation theory and related topics •
October 2024
Tame supercuspidals at very small primes
National University of Singapore •
September 2024
Tame supercuspidals at bad primes
Paris •
IMJ-PRG Reductive Groups and Automorphic Forms Seminar •
May 2024
Tame supercuspidals at bad primes
Poitiers •
May 2024
Tame supercuspidals at bad primes
CUNY •
Graduate Center Arithmetic Geometry Seminar •
May 2024
Tame supercuspidals at bad primes
Maryland •
Number Theory and Representation Theory seminar •
May 2024
Tame supercuspidals at bad primes
Boston College •
Number Theory/Representation Theory Seminar •
April 2024
Tame supercuspidals at bad primes
Bonn •
Arithmetic Geometry and Representation Theory Seminar •
December 2023
New supercuspidals at bad primes
West Lexham •
QuINGs •
August 2023
Rigid inner forms and the Bernstein decomposition for L-parameters
Nisyros •
Anaparastaseis •
July 2023
Classification of reductive groups
Bonn •
Bruhat–Tits Learning Seminar •
January 2023
The special fiber of a parahoric subgroup
Bonn •
Bruhat–Tits Learning Seminar •
November 2022
The Principal Block
Bonn •
Arithmetische Geometrie Oberseminar •
October 2022
Local Factors
and the Plancherel Measure
Bonn •
Community-Building in the Langlands Program •
August 2022
Reductive groups II:
Borel-Weil-Bott, linkage, translation
Oberwolfach •
Arbeitsgemeinschaft
"Geometric representation theory" •
April 2022
Recent progress on the formal degree conjecture
Luminy •
Periods, functoriality, and L-functions •
January 2022
Recent progress on the formal degree conjecture
Cambridge •
Number Theory Seminar •
October 2021
Recent progress on the formal degree conjecture
Arizona •
Number Theory Seminar •
August 2021
Orthogonal root numbers and the refined
formal degree conjecture
Oberwolfach •
Automorphic Forms, Geometry, and Arithmetic •
August 2021
Langlands, Weil, and local class field theory
Rutgers •
Graduate Number Theory Seminar •
August 2021
C*-algebras and Kirillov's coadjoint orbit method
Harish-Chandra Seminar
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March 2021
Background on the Gan-Gross-Prasad conjectures
Automorphic Seminar
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March 2021
Queer and trans mathematicians in algebra and number theory (QTMART) • Bonn • July 2025
Representations of p-adic groups • Oberwolfach • December 2024
Queer and trans mathematicians in algebra and number theory (QTMART) • Bonn • July 2025
Arbeitsgemeinschaft: Relative Langlands Duality • Oberwolfach • April 2025
Arizona Winter School 2025: Representation theory of p-adic groups • Tuscon • March 2025
Representation theory and noncommutative geometry • Paris • February–March 2025
Representations of p-adic groups • Oberwolfach • December 2024
Workshop on Shimura varieties, representation theory and related topics • Tokyo • October 2024
Bushnell memorial conference • London • September 2024
Guy Henniart birthday conference • Amiens • September 2023
Queer In Number Theory and Geometry (QuINGs) • West Lexham • August 2023
Anaparastaseis: Orbits, Hecke algebras, and representations • Nisyros • July 2023
Peter Schneider birthday conference • Münster • February 2023
Workshop on the Bezrukavnikov equivalence • Essen, Münster, Bonn • November 2022, December 2022, January 2023
Community-Building in the Langlands Program • Bonn • August 2022
Summer School on the Langlands Program • IHES • July 2022
Arbeitsgemeinschaft: Geometric Representation Theory • Oberwolfach • April 2022
Midwest Representation Theory Conference • Ann Arbor • March 2022
Periods, functoriality, and L-functions • Luminy • January 2022
Automorphic Forms, Geometry and Arithmetic (online) • Oberwolfach • August 2021
Affine Hecke algebras • Winter 2024–2025
Research seminar for "The Arithmetic of the Langlands Program" • Summer 2023
The Local Langlands Conjecture for Non-Quasi-Split Groups • Summer 2023
Bruhat–Tits Theory • Winter 2022–2023
Deligne–Lusztig Theory • Lent 2022
Algebra II: Local Fields • Lecturer • Winter 2023–2024
Galois Theory • Supervisor • 2021
Calculus I • Course co-coordinator • 2020
Calculus II • Lecturer • 2017, 2018, 2019
Differential equations • Recitation instructor • 2018
Calculus I • Lecturer • 2017
Precalculus • Lecturer • 2016
My last name is pronounced "shween". It rhymes with "clean", unlike the German pronunciation. In one-on-one interactions (e.g. email, conversations) you are welcome to just call me "David".