Modified Kolmogorov Wave Turbulence in QCD matched onto "Bottom-up" Thermalization
Abstract
We investigate modification of Kolmogorov wave turbulence in QCD calculating gluon spectra as functions of time in the presence of a low energy source which feeds in energy density in the infrared region at a time-dependent rate. Then considering the picture of saturation constraints as has been constructed in the "bottom-up" thermalization approach we revisit that picture for RHIC center-mass energy, W = 130 GeV, and also extend it to LHC center-mass energy, W = 5500 GeV, thus for two cases having an opportunity to calculate the equilibration time, taueq|therm, of the gluon system produced in a central heavy ion collision at mid-rapidity region. Thereby, at RHIC and LHC energies we can match the equilibration time, obtained from the late stage gluon spectrum of the modified Kolmogorov wave turbulence, onto that of the "bottom-up" thermalization and other evolutional approaches as well. In addition, from the revised "bottom-up" approach we find the gluon liberation coefficient to be on the average, c = 0.81 - 1.06 at RHIC and c = 0.50 - 0.56 at LHC. We also present other phenomenological estimates of tautherm which, at QCD realistic couplings, yield 0.45fm - 0.65fm < tautherm < 0.97fm - 2.72fm at RHIC and 0.31fm - 0.40fm < tautherm < 0.86fm - 2.04fm at LHC, both reflecting the original and modified Kolmogorov wave turbulent scenarios. In the latter case, at certain conditions, taking also into account both very small and realistic couplings we give estimates - 0.65fm < tautherm < 1.29fm at RHIC and 0.52fm < tautherm < 1.16fm at LHC, as well as at realistic couplings we find 0.53 < tautherm < 0.7fm at RHIC and 0.41 < tautherm < 0.65fm at LHC.