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arXiv 1006.3261hep-thhep-phnucl-th
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非共形全息背景中重夸克的朗之万扩散

Langevin diffusion of heavy quarks in non-conformal holographic backgrounds

U. Gursoy, E. Kiritsis, L. Mazzanti, F. Nitti

摘要:

讨论了非共形全息装置中相对论重夸克的朗之万扩散过程。体几何是一个一般的,五维渐近AdS黑洞。重夸克可以用一个附着在味膜上的尾弦来描述,它以恒定的速度运动。从描述弦世界片线性化涨落的方程出发,利用AdS/CFT方法构造了定义广义Langevin过程的关联函数.在局部极限下,得到了朗之万扩散系数和摩擦系数的解析表达式。这些量之间的修改爱因斯坦关系也推导出来。分析了朗之万谐振子的谱密度,得到了在小频率范围和大频率范围内的简单解析表达式。最后,在改进的全息QCD的情况下,对喷流猝灭参数进行了数值分析,并与RHIC唯象进行了比较。

英文摘要:

The Langevin diffusion process of a relativistic heavy quark in a non-conformal holographic setup is discussed. The bulk geometry is a general, five-dimensional asymptotically AdS black hole. The heavy quark is described by a trailing string attached to a flavor brane, moving at constant velocity. From the equations describing linearized fluctuations of the string world-sheet, the correlation functions defining a generalized Langevin process are constructed via the AdS/CFT prescription. In the local limit, analytic expressions for the Langevin diffusion and friction coefficients are obtained in terms of the bulk string metric. Modified Einstein relations between these quantities are also derived. The spectral densities associated to the Langevin correlators are analyzed, and simple analytic expressions are obtained in the small and large frequency limits. Finally, a numerical analysis of the jet-quenching parameter, and a comparison to RHIC phenomenology are performed in the case of Improved Holographic QCD.

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