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arXiv 2201.01622nucl-thhep-ph
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UrQMD中手征平均场物态方程对重离子压缩级的影响

A Chiral Mean-Field Equation-of-State in UrQMD: Effects on the Heavy Ion Compression Stage

Manjunath Omana Kuttan, Anton Motornenko, Jan Steinheimer, Horst Stoecker, Yasushi Nara, Marcus Bleicher

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11 pages, 7 figures, version accepted by: The European Physical Journal C
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摘要：

结果表明，在束流能量为$E_\mathrm{lab}=1-10A$ ~GeV的中心重离子碰撞中，初始压缩主要取决于基本的状态方程，而与动力学描述所用的模型关系不大.要做到这一点，将任何状态方程的UrQMD传输模型的程序。特别是，我们比较重子密度，温度和压力的演变，以及产生的熵在相对论理想流体力学方法和UrQMD输运模型，其中相同的状态方程中使用的两种方法。如果在任一动力学模型中使用相同的状态方程，不仅压缩相似，而且它还强烈地依赖于实际的状态方程。这些结果表明，在这些束流能量下，可以用对初始压缩相和重离子碰撞中达到的最大压缩敏感的观测量来研究状态方程。

英文摘要：

It is shown that the initial compression in central heavy ion collisions at beam energies of $E_\mathrm{lab}=1-10A$~GeV depends dominantly on the underlying equation of state and only marginally on the model used for the dynamical description. To do so, a procedure to incorporate any equation of state in the UrQMD transport model is introduced. In particular we compare the baryon density, temperature and pressure evolution as well as produced entropy in a relativistic ideal hydrodynamics approach and the UrQMD transport model, where the same equation of state is used in both approaches. Not only is the compression similar if the same equation of state is used in either dynamical model, but it also strongly depends on the actual equation of state. These results indicate that the equation of state can be studied with observables which are sensitive to the initial compression phase and maximum compression achieved in heavy ion collisions at these beam energies.

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