Rigidit\'{e} infinit\'{e}simale de c\^{o}nes-vari\'{e}t\'{e}s Einstein   \`{a} courbure n\'{e}gative
  Starting with a compact hyperbolic cone-manifold of dimension greater than or equal to 3, we study the deformations of the metric with the aim of getting Einstein cone-manifolds. If the singular locus is a closed codimension 2 submanifold and all cone angles are smaller than 2 pi, we show that there is no non-trivial infinitesimal Einstein deformations preserving the cone angles. 
Gr\'egoire Montcouquiol (LEP)