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arXiv 1302.0697hep-thgr-qchep-phnucl-th
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规范理论等离子体中的流体动力学梯度展开

Hydrodynamic gradient expansion in gauge theory plasmas

Michal P. Heller, Romuald A. Janik, Przemyslaw Witaszczyk

摘要:

我们利用流体-重力二元性来研究规范理论等离子体系统动力学的流体动力学梯度展开的高阶行为。这对应于包含耗散项和输运系数的非常高的顺序。使用双重力描述,我们计算数值的形式的应力张量的助推不变的流动中的流体动力学膨胀项与240个衍生物。我们观察到一个阶乘增长的梯度贡献在大订单,这表明零半径的收敛的流体动力学系列。此外,我们确定了领先的奇异性在Borel变换的流体动力学能量密度与最低的非流体动力学激发对应的“非流体动力学”的拟正规模式的重力侧。

英文摘要:

We utilize the fluid-gravity duality to investigate the large order behavior of hydrodynamic gradient expansion of the dynamics of a gauge theory plasma system. This corresponds to the inclusion of dissipative terms and transport coefficients of very high order. Using the dual gravity description, we calculate numerically the form of the stress tensor for a boost-invariant flow in a hydrodynamic expansion up to terms with 240 derivatives. We observe a factorial growth of gradient contributions at large orders, which indicates a zero radius of convergence of the hydrodynamic series. Furthermore, we identify the leading singularity in the Borel transform of the hydrodynamic energy density with the lowest nonhydrodynamic excitation corresponding to a `nonhydrodynamic' quasinormal mode on the gravity side.

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