Amoebas, tropical varieties and compactification of Teichmuller spaces

Details Amoebas, tropical varieties and compactification of Teichmuller spaces Amoebas, tropical varieties and compactification of Teichmuller spaces

2005-05-12

arxiv.org/abs/math/0505269v1

Mathematics

Algebraic Geometry

41 pages

Scientific paper

In this paper we try to look at the compactification of Teichmuller spaces from a tropical viewpoint. We describe a general construction for the compactification of algebraic varieties, using their amoebas, and we describe the boundary via tropical varieties. When we apply this construction to the Teichmuller spaces we see that they can be mapped in a real algebraic hypersurface in such a way that the cone over the boundary is a subpolyhedron of a tropical hypersurface. We want to show how some properties of the boundary becomes straightforward if looked at from this point of view. For example there is a PL structure that appears naturally on the boundary, and it is shown to be equivalent to the one defined by Thurston. Also we may see easily that every polynomial relation among trace functions on Teichmuller space may be turned automatically in a tropical relation among intersection forms over the boundary.

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