Abstract We will use the equivalence between strongly coupled gauge theories and gravity in Anti de Sitter space to study various aspects of gauge theories. Advisors David Mateos References http://arxiv.org/abs/arXiv:0709.1523 http://arxiv.org/abs/arXiv:1101.0618 http://arxiv.org/abs/hep-th/9905111 Email dmateos@icrea.cat Tags Particles and Gravitation