A Livsic type theorem for germs of analytic diffeomorphisms
  We deal with the problem of the validity of Livsic's theorem for cocycles of diffeomorphisms satisfying the orbit periodic obstruction over an hyperbolic dynamics. We give a result in the positive direction for cocycles of germs of analytic diffeomorphisms at the origin. 
Andr\'es Navas and Mario Ponce
math.DS