极化介质的理想相对论流体极限
The ideal relativistic fluid limit for a medium with polarization
摘要：
利用拉格朗日有效场论方法，建立了组分自由度具有微观极化的理想相对论流体的运动方程。我们讨论了这样一个系统的意义，并认为它是第一项在EFT适当的描述极化观测重离子碰撞，如末态粒子极化和手征磁和涡旋效应。我们发现，这个系统一般需要非耗散动力学在更高的阶梯度比二阶，导致潜在的稳定性问题与这样的系统。我们根据粘度的严格下限来评论这一点的重要性。
英文摘要：
We use Lagrangian effective field theory techniques to construct the equations of motion for an ideal relativistic fluid whose constituent degrees of freedom have microscopic polarization. We discuss the meaning of such a system, and argue that it is the first term in the EFT appropriate for describing polarization observables in heavy ion collisions, such as final state particle polarization and chiral magnetic and vortaic effects. We show that this system will generally require non-dissipative dynamics at higher order in gradient than second order, leading to potential stability issues known with such systems. We comment on the significance of this in the light of conjectured lower limits on viscosity.
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