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arXiv 1509.04049cond-mat.str-elnlin.CGphysics.comp-phphysics.flu-dyn
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强相互作用流体中的短寿命晶格准粒子

Short-lived lattice quasiparticles for strongly interacting fluids

M. Mendoza, S. Succi

摘要:

结果表明,基于短寿命准粒子的晶格动力学理论在模拟强相互作用流体(SIF)的复杂动力学过程中是非常有效的。特别是,它指出,晶格流体的剪切粘度是两个贡献的总和,一个是由于粒子之间的通常的相互作用(碰撞粘度),另一个是由于与离散晶格的相互作用(传播粘度)。由于后者是{ \it负数},因此其和可能比两个贡献中的每一个分别小几个数量级,从而提供了一种机制,以在碰撞粘度的普通值下访问SIF机制。这个概念,应用于量子超流体在一维光晶格,再现剪切粘度与AdS-CFT全息约束的粘度/熵比一致。这表明,晶格动力学理论继续保持强耦合的流体动力学制度,连续动力学理论可能不再适用。

英文摘要:

It is shown that lattice kinetic theory based on short-lived quasiparticles proves very effective in simulating the complex dynamics of strongly interacting fluids (SIF). In particular, it is pointed out that the shear viscosity of lattice fluids is the sum of two contributions, one due to the usual interactions between particles (collision viscosity) and the other due to the interaction with the discrete lattice (propagation viscosity). Since the latter is {\it negative}, the sum may turn out to be orders of magnitude smaller than each of the two contributions separately, thus providing a mechanism to access SIF regimes at ordinary values of the collisional viscosity. This concept, as applied to quantum superfluids in one-dimensional optical lattices, is shown to reproduce shear viscosities consistent with the AdS-CFT holographic bound on the viscosity/entropy ratio. This shows that lattice kinetic theory continues to hold for strongly coupled hydrodynamic regimes where continuum kinetic theory may no longer be applicable.

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