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Moduli spaces of local systems and higher Teichmüller theory

Vladimir FockAlexander Goncharov — 2006

Publications Mathématiques de l'IHÉS

Let G be a split semisimple algebraic group over with trivial center. Let S be a compact oriented surface, with or without boundary. We define representations of the fundamental group of S to G(), construct explicitly all positive representations, and prove that they are faithful, discrete, and positive hyperbolic; the moduli space of positive representations is a topologically trivial open domain in the space of all representations. When S have holes, we defined two moduli spaces closely related...

Cluster ensembles, quantization and the dilogarithm

Vladimir V. FockAlexander B. Goncharov — 2009

Annales scientifiques de l'École Normale Supérieure

A cluster ensemble is a pair ( 𝒳 , 𝒜 ) of positive spaces (i.e. varieties equipped with positive atlases), coming with an action of a symmetry group Γ . The space 𝒜 is closely related to the spectrum of a cluster algebra [12]. The two spaces are related by a morphism p : 𝒜 𝒳 . The space 𝒜 is equipped with a closed 2 -form, possibly degenerate, and the space 𝒳 has a Poisson structure. The map p is compatible with these structures. The dilogarithm together with its motivic and quantum avatars plays a central role...

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