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arXiv 2008.09638hep-thcond-mat.str-el
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全息次扩散

Holographic subdiffusion

Koushik Ganesan, Andrew Lucas

摘要:

我们利用规范-引力对偶性,在电荷和偶极守恒的无隙强耦合量子理论中研究有限温度输运。在一个非动力学引力模型中,我们的模型的体场包括一个合适的混合秩张量,它编码的边界多极对称性。我们描述了这样一个理论可以出现在低能量的理论与协变批量行动。研究响应函数在零密度,我们发现,通过一个四阶亚扩散方程,最近开发的场论框架一致的电荷松弛。

英文摘要:

We initiate a study of finite temperature transport in gapless and strongly coupled quantum theories with charge and dipole conservation using gauge-gravity duality. In a model with non-dynamical gravity, the bulk fields of our model include a suitable mixed-rank tensor which encodes the boundary multipole symmetry. We describe how such a theory can arise at low energies in a theory with a covariant bulk action. Studying response functions at zero density, we find that charge relaxes via a fourth-order subdiffusion equation, consistent with a recently-developed field-theoretic framework.

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