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Graph Complexes and higher genus Grothendieck-Teichm\"uller Lie algebras

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arxiv 2105.02056 v1 pith:RFGH72ZZ submitted 2021-05-05 math.QA

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keywords graphgrothendieck-teichmulleralgebragenusalgebrascohomologycomplexes
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abstract

We give a presentation in terms of generators and relations of the cohomology in degree zero of the Campos-Willwacher graph complexes associated to compact orientable surfaces of genus $g$. The results carry a natural Lie algebra structure, and for $g=1$ we recover Enriquez' elliptic Grothendieck-Teichm\"uller Lie algebra. In analogy to Willwacher's theorem relating Kontsevich's graph complex to Drinfeld's Grothendieck-Teichm\"uller Lie algebra, we call the results higher genus Grothendieck-Teichm\"uller Lie algebras. Moreover, we find that the graph cohomology vanishes in negative degrees.

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Cited by 1 Pith paper

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  1. The formality of the Goldman-Turaev Lie bialgebra on a closed surface

    math.QA 2025-02 accept novelty 8.0 of 10

    The pro-unipotent automorphism group of the associated graded Goldman-Turaev Lie bialgebra on a closed surface is explicitly described in terms of a divergence map and the kernel of a reduced coproduct.

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