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arXiv 1203.2452nucl-thhep-ph
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温度相关的剪切粘滞对超相对论重离子碰撞中横动量谱方位角不对称性的影响

Influence of a temperature-dependent shear viscosity on the azimuthal asymmetries of transverse momentum spectra in ultrarelativistic heavy-ion collisions

H. Niemi, G. S. Denicol, P. Huovinen, E. Molnár, D. H. Rischke

摘要:

研究了随温度变化的剪切粘滞系数对熵密度比$η/s$、不同的剪切弛豫时间$τ_π$以及不同的初始条件对带电强子和已识别粒子的横动量谱的影响。我们调查的方位流的不对称性作为碰撞能量和中心性的函数。在RHIC能区,椭圆流系数主要由强子粘性决定。只有在较高的碰撞能量的影响,在QGP相的粘度是可见的流动不对称性。然而,在QCD过渡区附近的剪切粘性对系统的集体流的影响最大。我们还发现,椭圆流的中心依赖性是敏感的温度依赖性的$η/s$。

英文摘要:

We study the influence of a temperature-dependent shear viscosity over entropy density ratio $η/s$, different shear relaxation times $τ_π$, as well as different initial conditions on the transverse momentum spectra of charged hadrons and identified particles. We investigate the azimuthal flow asymmetries as a function of both collision energy and centrality. The elliptic flow coefficient turns out to be dominated by the hadronic viscosity at RHIC energies. Only at higher collision energies the impact of the viscosity in the QGP phase is visible in the flow asymmetries. Nevertheless, the shear viscosity near the QCD transition region has the largest impact on the collective flow of the system. We also find that the centrality dependence of the elliptic flow is sensitive to the temperature dependence of $η/s$.

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