QUANTIZATION OF Γ-LIE BIALGEBRAS

Abstract. We introduce the notion of Γ-Lie bialgebras, where Γ is a group. These ob-jects give rise to cocommutative co-Poisson bialgebras, for which we construct quantization functors. This enlarges the class of co-Poisson algebras for which a quantization is known. Our result relies on our earlier work, where we showed that twists of Lie bialgebras can be quantized; we complement this work by studying the behavior of this quantization under compositions of twists. We work over a field k of characteristic 0. 1