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arXiv 1906.04752hep-thcond-mat.str-el
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强耦合磁化等离子体中的霍尔粘度

Hall Viscosity in a Strongly Coupled Magnetized Plasma

Carlos Hoyos, Francisco Peña-Benitez, Piotr Witkowski

摘要:

我们展示了如何霍尔粘度诱导的磁场可以产生强耦合理论与全息对偶。这是通过考虑宇称破缺引力对偶中的高阶导数项来实现的。这些项将黎曼曲率张量耦合到与荷电电流对偶的规范场的场强,并且在场论方面类似于"欧拉电流"和电磁场之间的耦合。作为一个具体的例子,我们研究了新项对$AdS_4$中强耦合磁化等离子体与双子黑洞对偶的热力学和输运性质的影响。作为全息模型的一个新性质,我们发现对于一个在零磁场下初始为中性的态,当磁场开启时,存在电荷密度和非耗散的霍尔输运,值得注意的是,我们还观察到即使在比温度大得多的磁场下,全息模型的结果也与流体力学相一致.

英文摘要:

We show how a Hall viscosity induced by a magnetic field can be generated in strongly coupled theories with a holographic dual. This is achieved by considering parity-breaking higher derivative terms in the gravity dual. These terms couple the Riemann curvature tensor to the field strength of a gauge field dual to the charge current, and have an analog in the field theory side as a coupling between the "Euler current" and the electromagnetic field. As a concrete example, we study the effect of the new terms in the thermodynamic and transport properties of a strongly coupled magnetized plasma dual to a dyonic black hole in $AdS_4$. As a new property of the holographic model, we find that for a state that is initially neutral at zero magnetic field, a charge density and non-dissipative Hall transport are present when the magnetic field is turned on. Remarkably, we also observe that the results from the holographic model are consistent with hydrodynamics even at magnetic fields much larger than temperature.

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