Parametrization of PSL(2,C)-representations of surface groups

Details Parametrization of PSL(2,C)-representations of surface groups Parametrization of PSL(2,C)-representations of surface groups

2011-10-31

arxiv.org/abs/1110.6674v1

Mathematics

Geometric Topology

55 pages, 31 figures

Scientific paper

For an oriented surface of genus g with b boundary components, we construct a rational map from a subset of C^{6g-6+3b} onto an open algebraic subset of the PSL(2,C)-character variety as an analogue of the Fenchel-Nielsen coordinates. After taking the quotient by an action of a finite group, we obtain a parametrization of a subset of the PSL(2,C)-character variety, and similarly for the SL(2,C)-character variety. We can systematically calculate a set of matrix generators by rational functions of the parameters. We give transformation formulae under elementary moves of pants decompositions.

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