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arXiv 1708.02252hep-thhep-ph
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强耦合非共形等离子体的准简正模及其临界性

Quasi-normal modes of a strongly coupled non-conformal plasma and approach to criticality

Panagiotis Betzios, Umut Gürsoy, Matti Järvinen, Giuseppe Policastro

摘要:

利用全息技术研究了一类强相互作用非共形等离子体中平衡态附近的涨落。特别是我们计算了黑洞背景的准正规模谱,它在红外线中接近Chamblin-Reall等离子体。在特定的极限下,与弦论中的精确线性背景相关,我们观察到等离子体接近临界,我们解析地得到了准正规谱。我们通过将对应于非共形等离子体的IR几何形状粘合到UV中的AdS时空的一部分来调节临界极限。近临界,我们发现两套准正常模式,有关的IR和UV部分的几何形状。在临界极限下,准简正模在复频率平面的实轴上积累形成能量动量张量的分支。

英文摘要:

We study fluctuations around equilibrium in a class of strongly interacting non-conformal plasmas using holographic techniques. In particular we calculate the quasi-normal mode spectrum of black hole backgrounds that approach to Chamblin-Reall plasmas in the IR. In a specific limit, related to the exact linear-dilaton background in string theory, we observe that the plasma approaches criticality and we obtain the quasi-normal spectrum analytically. We regulate the critical limit by gluing the IR geometry that corresponds to the non-conformal plasma to a part of AdS space-time in the UV. Near criticality, we find two sets of quasi-normal modes, related to the IR and UV parts of the geometry. In the critical limit, the quasi-normal modes accumulate to form a branch cut in the correlators of the energy-momentum tensor on the real axis of the complex frequency plane.

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