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arXiv 1209.0291hep-phhep-thnucl-th
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中间耦合处的热化

Thermalization at intermediate coupling

Dominik Steineder, Stefan A. Stricker, Aleksi Vuorinen

摘要:

利用AdS/CFT猜想研究了大N_cN =4的超杨-米尔斯等离子体在大而有限的t Hooft耦合极限下的热化.在引力方面,我们用O(λ ^3)算符的全集补充了IIB型超引力作用量,这使我们能够在一个全息热化模型中导出对瞬发光子发射光谱的O(λ^{-3/2})修正。从λ= \infty极限降低耦合强度,我们观察到光子谱密度作为光子能量的函数接近其热极限的方式发生了质的变化。我们将这种行为解释为等离子体的热化模式从顶部/向下向底部/向上移动的标志。

英文摘要:

We use the AdS/CFT conjecture to investigate the thermalization of 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(α'^3) operators, which enables us to derive O(λ^{-3/2}) corrections to the emission spectrum of prompt photons in one model of holographic thermalization. Decreasing the coupling strength from the λ=\infty limit, 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.

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