Dominik Steineder, Stefan A. Stricker, Aleksi Vuorinen
We use the AdS/CFT conjecture to investigate thermalization in large-N_c N=4 Super Yang-Mills plasma in the limit of large but finite 't Hooft coupling. On the gravity side, we supplement the type IIB supergravity action by the full set of O(alpha'^3) operators, which enables us to derive O(lambda^(-3/2)) corrections to the emission spectrum of prompt photons in one model of holographic thermalization. Decreasing the strength of the coupling from infinity, we observe a qualitative change in the way the photon spectral density approaches its thermal limit as a function of the photon energy. We interpret this behavior as a sign of the thermalization pattern of the plasma shifting from top/down towards bottom/up already at a coupling strength lambda~50.
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http://arxiv.org/abs/1209.0291
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