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arXiv 2007.05524hep-thhep-phnucl-thphysics.flu-dyn
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线性响应理论中的流体动力梯度展开

Hydrodynamic gradient expansion in linear response theory

Michal P. Heller, Alexandre Serantes, Michał Spaliński, Viktor Svensson, Benjamin Withers

摘要:

相对论性流体力学的一个基本问题是关于高阶流体动力学梯度展开的性质。我们建立了精确的条件下,这种梯度扩张发散的一个广泛的类微观理论承认相对论流体动力学的限制,在线性政权。我们的结果不依赖于高度对称的流体流动所利用的重离子碰撞和宇宙学的先前研究。当能量密度或速度场在动量空间中具有超过临界动量的支持时,流体动力学梯度展开发散,否则收敛。这个临界动量是微观理论的一个内在属性,由流体动力学色散关系的分支点奇点决定。

英文摘要:

A foundational question in relativistic fluid mechanics concerns the properties of the hydrodynamic gradient expansion at large orders. We establish the precise conditions under which this gradient expansion diverges for a broad class of microscopic theories admitting a relativistic hydrodynamic limit, in the linear regime. Our result does not rely on highly symmetric fluid flows utilized by previous studies of heavy-ion collisions and cosmology. The hydrodynamic gradient expansion diverges whenever energy density or velocity fields have support in momentum space exceeding a critical momentum, and converges otherwise. This critical momentum is an intrinsic property of the microscopic theory and is set by branch point singularities of hydrodynamic dispersion relations.

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