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Non-boost-invariant dissipative hydrodynamics

机译：非升压不变耗散流体动力学

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The one-dimensional non-boost-invariant evolution of the quark-gluon plasma, presumably produced during the early stages of heavy-ion collisions, is analyzed within the frameworks of viscous and anisotropic hydrodynamics. We neglect transverse dynamics and assume homogeneous conditions in the transverse plane but, differently from Bjorken expansion, we relax longitudinal boost invariance in order to study the rapidity dependence of various hydrodynamical observables. We compare the results obtained using several formulations of second-order viscous hydrodynamics with a recent approach to anisotropic hydrodynamics, which treats the large initial pressure anisotropy in a nonperturbative fashion. The results obtained with second-order viscous hydrodynamics depend on the particular choice of the second-order terms included, which suggests that the latter should be included in the most complete way. The results of anisotropic hydrodynamics and viscous hydrodynamics agree for the central hot part of the system, however, they differ at the edges where the approach of anisotropic hydrodynamics helps to control the undesirable growth of viscous corrections observed in standard frameworks.
机译：在粘性和各向异性流体动力学的框架内分析了在重离子碰撞的早期阶段期间夸克胶血管血浆的一维非升压不变演变。我们忽略横向动力学并在横向平面上呈现均匀的条件，但是，与Bjorken扩展不同，我们放松纵向增强不变性，以研究各种流体动力学可观察的快速依赖性。我们比较使用几种二阶粘性流体动力学配方获得的结果，其具有最近的各向异性流体动力学方法，其以非触发方式处理大的初始压力各向异性。用二阶粘性流体动力学获得的结果取决于所包括的二阶项的特定选择，这表明后者应以最完整的方式包含。各向异性流体动力学和粘性流体动力学的结果对系统的中心热部分同意，然而，它们在各向异性流体动力学的方法有助于控制标准框架中观察到的粘性校正的不希望生长。

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