Matthias Pfeifer

Doctoral Candidate at the Technical University of Munich (TUM)

Research Interests

I am broadly interested in algebraic geometry. My current focus is on deformations of singularities, particularly in positive and mixed characteristic. As doctoral project, I was able to prove that the class of isolated cyclic (lrq) singularities is stable under deformations in positive and mixed characteristic, generalizing the result in char 0.

My doctoral project sparked a number of follow-up questions:

Preprint

Deformations of isolated cyclic quotient singularities in arbitrary characteristic
Available on arXiv

Talks

2026 Deformations of isolated 𝐐-factorial toric singularities, Research School on Cox rings and applications, CIRM
2026 Equivariant Cohomology, Seminar on Enumerative Geometry, TUM
2025 Deformations of isolated cyclic quotient singularities, ICL-TUM Workshop on Arithmetic and Geometry
2025 Deformations of isolated cyclic quotient singularities, Research Seminar Algebraic Geometry, TUM
2025 Deformations of toric surface singularities in positive characteristic, GAeL XXXII
2025 An approach to noncommutative algebraic geometry, Research Seminar ''Algebraic Geometry'', TUM
2024 Deforming christmas presents, TopMath Christmas Party, TUM
2024 F-splitting, Seminar on F-Singularities, TUM
2023 Charts and fine log-structures, Seminar on Log-Geometry, TUM

Poster

2026 Deformations of Isolated 𝐐-Factorial Toric Singularities