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We study the application of IBL-infinity-algebras to string topology andexplicitly compute the case of spheres. This involves finding a Green kerneland computing integrals associated to trivalent ribbon graphs, which aresimilar to integrals from perturbative Chern-Simons theory. We generalize thecomputation and show that the twisted IBL-infinity-structure in question is inmany cases trivial.

Twisted IBL-infinity-algebra and string topology: First look and examples