motivated by perturbative computations of feynman integrals, kontsevich has conjectured that a certain group known as the grothendieck-teichmuller group acts on the moduli space of field theories. moreover he has explicitly described this action in certain examples. we first describe a stable context for this question, which can be interpreted as inverting free bosonic field theories. we then show that a quotient of the gt group acts on the stable object in agreement with computations made by kontsevich. we will try to make this talk as self contained as possible.