Energy image density property and the lent particle method for Poisson   measures
  We introduce a new approach to absolute continuity of laws of Poisson functionals. It is based on the {\it energy image density} property for Dirichlet forms and on what we call {\it the lent particle method} which consists in adding a particle and taking it back after some calculation. 
Nicolas Bouleau (CERMICS), Laurent Denis (DP)