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arXiv 2408.09498hep-thgr-qc
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热且致密的强耦合等离子体中新的纯阻尼准正规模式对

New purely damped pairs of quasinormal modes in a hot and dense strongly-coupled plasma

Gustavo de Oliveira, Romulo Rougemont

AI总结:

本文通过2RCBH全息模型数值求解热致密强耦合等离子体的准正规模式,发现了在化学势较大时主导晚期平衡化的纯虚数阻尼模式对,并揭示了渐近极点融合现象,表明等离子体特征平衡化时间存在上限。

摘要:

受扰动的黑洞表现出阻尼振荡,其本征频率定义了它们的准正规模式(QNMs)。在渐近反德西特(AdS)黑洞的情况下,QNMs的谱通过全息规范-引力对偶性,与特定强相互作用量子场论的近平衡行为相关。在本工作中,我们数值求解了一种自上而下的全息构造,即2 R-荷黑洞(2RCBH)模型的均匀非流体力学QNMs的谱,该模型描述了热且致密的强耦合等离子体。主要结果是发现了一种新的纯虚数QNMs对结构。这些新的纯阻尼QNMs在化学势取大值时主导了强耦合等离子体的晚期平衡化,而在化学势取较低值时,基本的QNMs则是具有虚部和实部的普通极点,描述振荡衰减的扰动。我们还观察到了在化学势取渐近大值时,不同纯虚数QNMs对出现渐近极点融合的新现象。该现象对应于每对纯虚数QNMs中两个极点的渐近合并,且在介质的空间SO(3)旋转对称性相关的不同不可约表示所对应的所有不同扰动通道中,不同合并极点对以4π的常数值均匀间隔。特别地,这表明等离子体的特征平衡化时间发展出了上限,无法通过进一步以增加化学势的方式向介质掺杂来超越该上限。

英文摘要:

Perturbed black holes exhibit damped oscillations whose eigenfrequencies define their quasinormal modes (QNMs). In the case of asymptotically Anti-de Sitter (AdS) black holes, the spectra of QNMs are related to the near-equilibrium behavior of specific strongly interacting quantum field theories via the holographic gauge-gravity duality. In the present work, we numerically obtain the spectra of homogeneous non-hydrodynamic QNMs of a top-down holographic construction called the 2 R-Charge Black Hole (2RCBH) model, which describes a hot and dense strongly-coupled plasma. The main result is the discovery of a new structure of pairs of purely imaginary QNMs. Those new purely damped QNMs dominate the late time equilibration of the strongly-coupled plasma at large values of the chemical potential, while at lower values the fundamental QNMs are instead ordinary poles with imaginary and real parts describing oscillatory decaying perturbations. We also observe a new phenomenon of asymptotic pole fusion for different pairs of purely imaginary QNMs at asymptotically large values of the chemical potential. This phenomenon corresponds to the asymptotic merging of the two poles within each pair of purely imaginary QNMs, with the different pairs of merged poles being evenly spaced by a constant value of $4π$ in all the different perturbation channels associated to different irreducible representations of the spatial $SO(3)$ rotation symmetry of the medium. In particular, this indicates that characteristic equilibration times for the plasma develop upper bounds that cannot be surpassed by further doping the medium with increasing values of the chemical potential.

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