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arXiv 2012.15535hep-ph
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手征动力学与排斥相互作用之间的相互作用

Interplay between chiral dynamics and repulsive interactions

Michał Marczenko, Krzysztof Redlich, Chihiro Sasaki

摘要:

我们研究了热强子物质中的净重子数密度的涨落。我们讨论了手征动力学和排斥相互作用之间的相互作用,以及它们对手征交叉附近这些波动性质的影响。手征动力学模型的宇称二重拉格朗日,包括通过标量和矢量介子的交换介导的吸引力和排斥力的相互作用,分别。平均场近似是用来解释手征临界性。我们着重研究了六阶以下的净重子数密度累积量的性质和系统学。结果表明,高阶累积量表现出大量的抑制附近的手性相变由于排斥相互作用的存在。然而,我们发现,在格点量子色动力学结果中观察到的手征交叉附近的累积量的特征性质完全与临界手征动力学相关,并且一般来说,无法在唯象模型中重现,该模型仅通过排除体积修正或范德华力型相互作用来解释有效的排斥相互作用。因此,在手征交叉的净重子密度的高阶累积量的描述需要一个自洽的处理的手征介质中的影响和排斥相互作用。

英文摘要:

We investigate fluctuations of the net-baryon number density in hot hadronic matter. We discuss the interplay between chiral dynamics and repulsive interactions and their influence on the properties of these fluctuations near the chiral crossover. The chiral dynamics is modeled by the parity doublet Lagrangian that incorporates the attractive and repulsive interactions mediated via the exchange of scalar and vector mesons, respectively. The mean-field approximation is employed to account for chiral criticality. We focus on the properties and systematics of the cumulants of the net-baryon number density up to the sixth order. It is shown that the higher-order cumulants exhibit a substantial suppression in the vicinity of the chiral phase transition due to the presence of repulsive interactions. We find, however, that the characteristic properties of cumulants near the chiral crossover observed in lattice QCD results are entirely linked to the critical chiral dynamics and, in general, cannot be reproduced in phenomenological models, which account only for effective repulsive interactions via excluded-volume corrections or van-der-Waals type interactions. Consequently, a description of the higher-order cumulants of the net-baryon density in the chiral crossover requires a self-consistent treatment of the chiral in-medium effects and repulsive interactions.

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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