Universal scaling of unequal-time correlation functions in ultracold   Bose gases far from equilibrium
  We explore the far-from-equilibrium dynamics of Bose gases in a universal regime associated to nonthermal fixed points. While previous investigations concentrated on scaling functions and exponents describing equal-time correlations, we compute the additional scaling functions and dynamic exponent $z$ characterizing the frequency dependence or dispersion from unequal-time correlations. This allows us to compare the characteristic condensation and correlation times from a finite-size scaling analysis depending on the system's volume. 
A. Schachner, A. Pi\~neiro Orioli, J. Berges
cond-mat.quant-gas cond-mat.stat-mech hep-ph