Out-of-equilibrium generalized fluctuation-dissipation relations
  We discuss fluctuation-dissipation relations valid under general conditions even out of equilibrium. The response function is expressed in terms of unperperturbed correlation functions, where contributions peculiar to non-equilibrium can appear. Such extra terms take into account the interaction among the relevant degrees of freedom in the system. We illustrate the general formalism with two examples: driven granular systems and anomalous diffusion on comb structures. 
Giacomo Gradenigo, Andrea Puglisi, Alessandro Sarracino, Dario   Villamaina and Angelo Vulpiani
cond-mat.stat-mech cond-mat.soft