Stress-stress correlator in ϕ4 theory: poles or a cut?
Stress-stress correlator in ϕ4 theory: poles or a cut?
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ψ4 理论中的应力-应力相关器：极点还是切点？
DOI：
10.1007/jhep05(2018)084
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发表时间：
2018
影响因子：
5.4
通讯作者：
G. Moore
中科院分区：
文献类型：
--
作者：
G. Moore
摘要本文研究了热弱耦合λϕ4理论中零动量和小频率（与剪切粘度和流体动力响应相关）下无迹应力张量2点函数的解析性质。我们表明，相关器沿着负虚频率轴有一个切割，而不是一个或几个极点。我们简要讨论了这一结果对构建热相对论场论的二阶流体力学模型的意义。
A bstractWe explore the analytical properties of the traceless stress tensor 2-point function at zero momentum and small frequency (relevant for shear viscosity and hydrodynamic response) in hot, weakly coupled λϕ4 theory. We show that, rather than one or a small number of poles, the correlator has a cut along the negative imaginary frequency axis. We briefly discuss this result’s relevance for constructing 2’nd order hydrodynamic models of hot relativistic field theories.