Mathematics – Quantum Algebra
Scientific paper
2010-09-08
Mathematics
Quantum Algebra
23 Figures
Scientific paper
We show that the zeroth cohomology of Kontsevich's graph complex is isomorphic to the Grothendieck-Teichm\"uller Lie algebra grt. The map is explicitly described. This result has applications to deformation quantization and Duflo theory. Also, it allows proving the freeness part of the Deligne-Drinfeld conjecture in some low orders. As a side result one obtains that the homotopy deformations of the Gerstenhaber operad are parameterized by grt. Finally, our methods give a second proof of a result of H. Furusho, stating that the pentagon equation for grt-elements implies the hexagon equation.
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