Some totally non-congruence subgroups of PSL(2,Z) and their modular embeddings

Speaker:

Martin Möller

Affiliation:

U Frankfurt

Date:

Tue, 2013-03-12 14:00 - 15:00

Location:

MPIM Lecture Hall [2]

Parent event:

Seminar on Algebra, Geometry and Physics [3]

Veech groups of square-tiled surfaces are a natural source
of non-congruence subgroups of PSL(2,Z). Following work of G.Weitze-Schmitthüsen and C.Weiss we show that they are 'totally non-congruence'.
However, due to their geometric origin Veech groups come with a modular embedding and we discuss consequences for modular forms for these groups.