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arXiv 1602.02813nucl-thhep-phnucl-ex
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重离子碰撞中各向异性流的模耦合效应

Mode-coupling effects in anisotropic flow in heavy-ion collisions

Jing Qian, Ulrich W. Heinz, Jia Liu

摘要:

重离子碰撞中的高阶各向异性流受到非线性模耦合效应的影响。有人建议,相关的非线性流体动力学响应系数探测的传输特性,并在很大程度上不敏感的初始密度波动的频谱中创建这些碰撞的介质。为了验证这一建议,我们探索非线性模式耦合效应的事件粘性流体动力学,使用两种不同的模型的波动的初始密度分布,并比较非线性耦合系数的初始偏心率矢量之前的流体动力学膨胀和最终的流量矢量后的膨胀。对于几个模式耦合系数,我们发现显着的敏感性,初始波动谱。它们都表现出较强的敏感性,在冻结比剪切粘度,但只有弱的依赖性的剪切粘度在流体动力学演化。

英文摘要:

Higher-order anisotropic flows in heavy-ion collisions are affected by nonlinear mode coupling effects. It has been suggested that the associated nonlinear hydrodynamic response coefficients probe the transport properties and are largely insensitive to the spectrum of initial density fluctuations of the medium created in these collisions. To test this suggestion, we explore nonlinear mode coupling effects in event-by-event viscous fluid dynamics, using two different models for the fluctuating initial density profiles, and compare the nonlinear coupling coefficients between the initial eccentricity vectors before hydrodynamic expansion and the final flow vectors after the expansion. For several mode coupling coefficients we find significant sensitivity to the initial fluctuation spectrum. They all exhibit strong sensitivity to the specific shear viscosity at freeze-out, but only weak dependence on the shear viscosity during hydrodynamic evolution.

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