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Workgroup on Number Theory and Algebraic Geometry

Kollegiengebäude Mathematik (20.30)
Room 1.027

Englerstraße 2, 76131 Karlsruhe

Office hours:
Mo - Fr, 9.15 - 11.45

Tel.: +49 721 608 43041

Fax.: +49 721 608 44244

Research project: With origamis to Teichmüller curves in moduli space

funded by the Eliteprogramm für Postdoktorandinnen
und Postdoktoranden der Landesstiftung Baden-Württemberg

In this project, we investigate Teichmueller curves coming from origamis. In particular, we are interested in their algebraic and geometric properties, their position in the moduli space, their intersection behaviour and their Veech groups as subgroups of SL(2,Z).

People in the project

Project group 1


  • Weihnachtsworkshop 2008: December 15 to 17
  • Talk on Non discrete and non finitely generated Veech groups by Ferran Valdez (MPI Bonn), July 17 2008 in the Mathematischen Kolloquium der Fakultät
  • Talk on Counting trajectories for rectangular billiards and counting pillow covers by Jayadev Athreya (Princeton University), May 29 2008 in the Mathematischen Kolloquium der Fakultät
  • Weihnachtsworkshop 2007

Related links

Project description

We investigate algebraic curves in the moduli space of curves M_g or M_{g,n} that are described by few combinatorial data - thanks to so called origamis or square tiled surfaces. These curves are called origami curves and they are special cases of Teichmueller curves. Every Teichmueller curve is characterized by its Veech group, a discrete subgroup of SL(2,R) that is at the same time a subgroup of the mapping class group.

Although the construction principles for origami curves are very simple and there is even an algorithm that determines the Veech group of a given origami, very little is know today about these curves: what are their common properties and their fields of definition? What is their position in the moduli space?

Project group 2

Workgroup Number Theory and Algebraic Geometry
Institute for Algebra and Geometry
Universitaet Karlsruhe
76128 Karlsruhe