I work in the cryptography team of IBM Deutschland Research & Development.
Before that, I was an associate professor substitute of mathematics at Universität Würzburg, and before that, I was a Marie Skłodowska-Curie postdoctoral fellow at Rijksuniversiteit Groningen and a postdoctoral researcher at Leibniz Universität Hannover and Universität Bayreuth.
Research topics
Arithmetic geometry, especially arithmetic and computational aspects of curves and abelian varieties over arithmetic fields, their rational points (especially of modular curves), modular forms, Galois representations, L-functions, and cohomology
abelian varieties and the
The Birch–Swinnerton-Dyer (BSD) conjecture states a surprising and deep relation between algebraic and analytic, local and global invariants of elliptic curves over Q, and more generally of abelian varieties over global fields. There are many important consequences, for example the existence of an algorithm to compute the Mordell–Weil group.
over number fields: explicit methods and Iwasawa theory
in positive characteristic: over higher-dimensional bases
rational points on
Modular curves are moduli spaces for elliptic curves with additional data like level structure, e.g., isogenies of degree N. Knowing their rational points is important for many other questions in arithmetic geometry. For example, they allow one to classify the possible torsion subgroups of elliptic curves over Q.
explicit and theoretical methods, for example using the Chabauty–Kim method