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arXiv 1902.08368hep-phnucl-th
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相对论性重离子碰撞中具有变化化学势的流动和涡度

Flow and vorticity with varying chemical potential in relativistic heavy ion collisions

Abhisek Saha, Soma Sanyal

备注：
Revised version contains revised graphs of average vorticity, new graphs for thermal vorticity and specific shear viscosity
发表信息：
International Journal of Modern Physics E, February 2020
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摘要：

研究了相对论性重离子碰撞中涡旋斑图随碰撞能量的变化。碰撞能与热统计模型中所用的化学势有关，该模型假设相对论碰撞后近似的化学平衡。利用多相输运模型（AMPT）研究了相对论重离子碰撞中初始部分子相和最终强子相的涡度。我们发现，随着化学势的增加，旋涡的尺寸更大。使用不同的涡度定义，我们发现，涡度起着更大的作用，在较低的碰撞能量比在较高的碰撞能量。我们也看看在不同的碰撞能量的体积粘度和剪切粘度相关的流动模式的其他影响。我们发现得到的剪切粘度几乎是一个常数，在较高的碰撞能量有一个小的减少。我们也看看椭圆流，因为它是在碰撞后的最后阶段的粘性效应有关。我们的研究结果表明，粘度起着更大的作用，在较高的化学势和较低的碰撞能量。

英文摘要：

We study the vorticity patterns in relativistic heavy ion collisions with respect to the collision energy. The collision energy is related to the chemical potential used in the thermal - statistical models that assume approximate chemical equilibrium after the relativistic collision. We use the multiphase transport model (AMPT) to study the vorticity in the initial parton phase as well as the final hadronic phase of the relativistic heavy ion collision. We find that as the chemical potential increases,the vortices are larger in size. Using different definitions of vorticity, we find that vorticity plays a greater role at lower collision energies than at higher collision energies. We also look at other effects of the flow patterns related to the bulk viscosity and the shear viscosity at different collision energies. We find that the shear viscosity obtained is almost a constant with a small decrease at higher collision energies. We also look at the elliptic flow as it is related to viscous effects in the final stages after the collision. Our results indicate that viscosity plays a greater role at higher chemical potential and lower collision energies.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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