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We explore the far-from-equilibrium dynamics of Bose gases in a universalregime associated to nonthermal fixed points. While previous investigationsconcentrated on scaling functions and exponents describing equal-timecorrelations, we compute the additional scaling functions and dynamic exponent$z$ characterizing the frequency dependence or dispersion from unequal-timecorrelations. This allows us to compare the characteristic condensation andcorrelation times from a finite-size scaling analysis depending on the system'svolume.

Universal scaling of unequal-time correlation functions in ultracold Bose gases far from equilibrium