标题： 非平衡手征流体动力学包括耗散和噪声 显示英文标题

标题： Nonequilibrium chiral fluid dynamics including dissipation and noise

摘要： 我们提出了一种一致的理论方法，在包含组成夸克的线性sigma模型框架下，研究手征流体动力学中的非平衡效应。 将夸克视为平衡的热浴，我们使用影响泛函形式得到sigma场的朗之万方程。 这使我们能够计算阻尼系数和噪声关联函数的显式形式。 为了自洽地推导sigma场和夸克流体的动力学，我们必须采用2PI（两粒子不可约）有效作用量形式。 从场到流体的能量耗散在2PI有效作用量的精确形式中处理，其中可以构造一个守恒的能量动量张量。 我们推导了它的形式，并对生成整个系统能量动量平衡中额外项的近似进行了评论。 显示英文摘要

摘要： We present a consistent theoretical approach for the study of nonequilibrium effects in chiral fluid dynamics within the framework of the linear sigma model with constituent quarks. Treating the quarks as an equilibrated heat bath we use the influence functional formalism to obtain a Langevin equation for the sigma field. This allows us to calculate the explicit form of the damping coefficient and the noise correlators. For a selfconsistent derivation of both the dynamics of the sigma field and the quark fluid we have to employ the 2PI (two-particle irreducible) effective action formalism. The energy dissipation from the field to the fluid is treated in the exact formalism of the 2PI effective action where a conserved energy-momentum tensor can be constructed. We derive its form and comment on approximations generating additional terms in the energy-momentum balance of the entire system.