%0 Journal Article %T Semi-simple Lie groups acting conformally on compact Lorentz manifolds %A Vincent Pecastaing %J Mathematics %D 2015 %I arXiv %X We give a classification, up to local isomorphisms, of semi-simple Lie groups without compact factors that can act faithfully and conformally on a compact Lorentz manifold of dimension greater than or equal to $3$. %U http://arxiv.org/abs/1506.08693v1