%0 Journal Article %T Virial identity and weak dispersion for the magnetic Dirac equation %A Nabile Boussaid %A Piero D'Ancona %A Luca Fanelli %J Mathematics %D 2009 %I arXiv %X We analyze the dispersive properties of a Dirac system perturbed with a magnetic field. We prove a general virial identity; as applications, we obtain smoothing and endpoint Strichartz estimates which are optimal from the decay point of view. We also prove a Hardy-type inequality for the perturbed Dirac operator. %U http://arxiv.org/abs/0911.1287v2