Thursday, 10th July 2008, 4:00 pm

Mathematics Building, Lecture Hall 2

Barak Weiss

(Ben Gurion University)

"Lattice surfaces, the Veech dichotomy and generalizations"

** Abstract: **Translation surfaces are objects which arise naturally in several different
mathematical domains, e.g. complex analysis, topology of surface
homeomorphisms, and the study of rational polygonal billiards. The
symmetries of a given translation surface M naturally give rise to a
subgroup of SL(2,R) called the Veech group of M. For generic M the Veech
group is trivial, however in many cases it is quite large. In particular M
is called a lattice surface if its Veech group is a lattice in SL(2,R). In
1989 Veech constructed many examples of lattice surfaces and showed that
they have very interesting dynamical properties. We will present recent
joint work with John Smillie and Pascal Hubert extending some of Veech's
results. No prior acquaintance with Veech surfaces will be assumed, and
pictures will be shown.

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