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arXiv 2008.03994hep-thcond-mat.stat-mechhep-phmath-phmath.MPphysics.flu-dyn
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非相对论流体力学的有效场论

Effective field theory for non-relativistic hydrodynamics

Akash Jain

摘要:

我们写了一个Schwinger-Keldysh有效场论的非相对论(伽利略)流体力学。我们使用零背景的建设,协变耦合伽利略场论的背景源。在这种语言中,伽利略流体动力学被改写为相对论性流体动力学,它是在一个允许零基灵矢量的一维更高时空上制定的。这使我们能够导入现有的相对论流体力学的场论技术到伽利略设置,与微小的修改,包括额外的背景矢量场。我们用这个公式来建立一个描述热平衡附近能量、动量和密度模随机涨落的相互作用场论。我们还提出了一个翻译我们的结果,更传统的牛顿-嘉当语言,并讨论如何同样可以通过非相对论性限制的相对论流体力学的有效场论。

英文摘要:

We write down a Schwinger-Keldysh effective field theory for non-relativistic (Galilean) hydrodynamics. We use the null background construction to covariantly couple Galilean field theories to a set of background sources. In this language, Galilean hydrodynamics gets recast as relativistic hydrodynamics formulated on a one-dimension higher spacetime admitting a null Killing vector. This allows us to import the existing field-theoretic techniques for relativistic hydrodynamics into the Galilean setting, with minor modifications to include the additional background vector field. We use this formulation to work out an interacting field theory describing stochastic fluctuations of energy, momentum, and density modes around thermal equilibrium. We also present a translation of our results to the more conventional Newton-Cartan language and discuss how the same can be derived via a non-relativistic limit of the effective field theory for relativistic hydrodynamics.

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