Symmetry, Integrability and Geometry: Methods and Applications (SIGMA)


SIGMA 3 (2007), 066, 37 pages      math.AG/0610872      https://doi.org/10.3842/SIGMA.2007.066
Contribution to the Vadim Kuznetsov Memorial Issue

Teichmüller Theory of Bordered Surfaces

Leonid O. Chekhov
Steklov Mathematical Institute, Moscow, Russia
Institute for Theoretical and Experimental Physics, Moscow, Russia
Poncelet Laboratoire International Franco-Russe, Moscow, Russia
Concordia University, Montréal, Quebec, Canada

Received January 05, 2007, in final form April 28, 2007; Published online May 15, 2007

Abstract
We propose the graph description of Teichmüller theory of surfaces with marked points on boundary components (bordered surfaces). Introducing new parameters, we formulate this theory in terms of hyperbolic geometry. We can then describe both classical and quantum theories having the proper number of Thurston variables (foliation-shear coordinates), mapping-class group invariance (both classical and quantum), Poisson and quantum algebra of geodesic functions, and classical and quantum braid-group relations. These new algebras can be defined on the double of the corresponding graph related (in a novel way) to a double of the Riemann surface (which is a Riemann surface with holes, not a smooth Riemann surface). We enlarge the mapping class group allowing transformations relating different Teichmüller spaces of bordered surfaces of the same genus, same number of boundary components, and same total number of marked points but with arbitrary distributions of marked points among the boundary components. We describe the classical and quantum algebras and braid group relations for particular sets of geodesic functions corresponding to An and Dn algebras and discuss briefly the relation to the Thurston theory.

Key words: graph description of Teichmüller spaces; hyperbolic geometry; algebra of geodesic functions.

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