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arXiv 2004.03118nucl-th
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相对论重离子碰撞中的温度涨落和Tsallis统计

Temperature fluctuations and Tsallis statistics in Relativistic Heavy Ion collisions

Abhisek Saha, Soma Sanyal

备注：
19 pages 7 figures Revised version with improved figures and details of temperature calculation. Accepted for publication in MPLA
发表信息：
Modern Physics Letters A Vol. 36, No. 22, 2150152 (2021)
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摘要：

利用多相输运模型研究了相对论重离子碰撞初始阶段的温度涨落。我们认为等离子体在碰撞后的初始阶段，才有机会平衡。我们考虑了质心能量为200 GeV的Au + Au碰撞。本文用非广延Tsallis统计量求出了相对论性重离子碰撞部分子阶段的熵指数。我们发现，在重离子碰撞的部分子阶段，温度与熵指数呈线性关系。这已经在强子阶段观察到了。详细分析了熵指数对系统的依赖关系，结果表明，随着时空快度的增加，部分子系统的熵指数增加。熵指数还取决于束碰撞能量。由实验数据拟合横动量计算熵指数涉及强子相。然而，我们目前的研究表明，在碰撞的初始非平衡阶段的熵指数的行为是非常相似的强子阶段的熵指数的行为。

英文摘要：

We study temperature fluctuations in the initial stages of the relativistic heavy ion collision using a multiphase transport model. We consider the plasma in the initial stages after collision before it has a chance to equilibrate. We have considered Au + Au collision with a center of mass energy of 200 GeV. We use the non extensive Tsallis statistics to find the entropic index in the partonic stages of the relativistic heavy ion collisions. We find that the temperature and the entropic index have a linear relationship during the partonic stages of the heavy ion collision. This has already been observed in the hadronic phase. A detailed analysis of the dependence of the entropic index on the system shows that for increasing space time rapidity, the entropic index of the partonic system increases. The entropic index also depends on the beam collision energy. The calculation of the entropic index from the experimental data fitting of the transverse momenta deals with the hadronic phase. However, our current study shows that the behaviour of the entropic index in the initial non-equilibrium stage of the collision is very similar to the behaviour of the entropic index in the hadronic stage.

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