2 - 5 April 2013

**Organisers**: Anton Alekseev (*Université de Genève*), John Jones (*University of Warwick*), Bruno Vallette (*Université de Nice Sophia Antipolis*) and Chenchang Zhu Bartholdi (*Georg-August-Universität Göttingen*).

in association with the Newton Institute programme Grothendieck-Teichmüller Groups, Deformation and Operads

(3 January - 26 April 2013)

Poster Session | Programme | Participants | Application | Accommodation and Costs | Forum | Group Photograph

The notion of an operad was introduced in the late 60's in algebraic topology as a tool to encode higher homotopies. It enjoyed a renaissance in the 90's when M. Kontsevich and others used algebraic operads in deformation theory.

The passage from classical mechanics to quantum mechanics prompted the general mathematical problem of deformation quantization. In Poisson geometry, such a problem was solved by D. Fedosov for symplectic manifolds, by V. Drinfeld for Poisson-Lie groups, and by M. Kontsevich for Poisson manifolds. In 1998, six months after Kontsevich's original proof, D. Tamarkin gave another but purely operadic proof of the deformation quantization of Poisson manifolds, using the formality of the little discs operad, the Deligne conjecture, and the deformation-quantization of Lie bialgebras due to P. Etingof and D. Kazhdan.

The introduction of operadic graph homology in 1991 by M. Kontsevich allowed V. Ginzburg and M. Kapranov, and E. Getzler and J. Jones to develop the Koszul duality theory on the level of algebraic operads. This theory gives a conceptual explanation of the duality between commutative algebras and Lie algebras in Rational Homotopy Theory, developed by D. Quillen and D. Sullivan. It was also shown by M. Kontsevich, E. Getzler, and Y.I. Manin to share nice relationships with moduli spaces of curves, i.e. quantum cohomology and Frobenius manifolds. The operadic calculus play a key role in Quantum Field Theory in mathematical physics since it provides an algebraic way to control higher structures.

The goal of this conference is to cover the most recent and interesting developments of these fields of research.

**Berglund, A**,*(Stockholm University)*, Sweden**Cattaneo, AS**,*(Universität Zürich)*, Switzerland-
**Cohen, R**,*(Stanford University)*, USA -
**Dotsenko, V**,*(Trinity College Dublin)*, Ireland -
**Francis, J**,*(Northwestern University)*, USA **Getzler, E**,*(Northwestern University)*, USA**Giansiracusa, J**,*(Swansea University)*, United Kingdom-
**Hess, K**,*(EPFL - Ecoles Polytechniques Fédérales de Lausanne)*, Switzerland **Manin, YI**,*(Max-Planck-Institut fur Mathematik, Bonn)*, Germany-
**Moerdijk, I**,*(Radboud Universiteit Nijmegen)*, Netherlands -
**Pridham, JP**,*(University of Cambridge)*, United Kingdom -
**Roytenberg, D**,*(Universiteit Utrecht)*, Netherlands **Segal, G**,*(University of Oxford)*, United Kingdom**Severa, P**,*(Université de Genève)*, Switzerland**Tillmann, U**,*(University of Oxford)*, United Kingdom**Toën, B**,*(Université de Montpellier 2)*, France-
**Tsygan, B**,*(Northwestern University)*, USA -
**Wahl, N**,*(University of Copenhagen)*, Denmark **Willwacher, T**,*(Harvard University)*, USA

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