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arXiv 2301.09866nucl-thhep-ph
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强子物质中液气相变与手征相变附近的涨落

Fluctuations near the liquid-gas and chiral phase transitions in hadronic matter

Michał Marczenko, Krzysztof Redlich, Chihiro Sasaki

AI总结:

本文通过宇称双重态拉格朗日量与平均场近似,研究了致密强子物质中净重子数密度的涨落,发现正宇称态二阶磁化率在手征对称性恢复时变负,可作为接近手征相边界临界点的标志,有助于解释重离子碰撞实验数据。

摘要:

我们研究了致密强子物质中净重子数密度的涨落。手征动力学通过宇称双重态拉格朗日量进行建模,并采用平均场近似来解释手征临界性。我们重点关注在手征恢复时质量变得简并的各个正宇称和负宇称核子的净重子数密度二阶磁化率的定性性质和系统性规律。结果表明,当手征对称性恢复时,正宇称态的二阶磁化率可能变为负值,这是质量与序参量之间独特关系的自然结果。此外,我们发现这种负涨落标志着正在接近手征相边界上的临界点。我们的结果可能对解释重离子碰撞中净质子涨落的实验数据产生影响。

英文摘要:

We investigate the fluctuations of the net-baryon number density in dense hadronic matter. Chiral dynamics is modeled via the parity doublet Lagrangian, and the mean-field approximation is employed to account for chiral criticality. We focus on the qualitative properties and systematics of the second-order susceptibility of the net-baryon number density for individual positive- and negative-parity nucleons whose masses become degenerate at the chiral restoration. It is shown that the second-order susceptibility of the positive-parity state can become negative when the chiral symmetry is restored, as a natural consequence of the unique relationship of the mass to the order parameter. Moreover, we find that such negative fluctuations are indicative of approaching the critical point on the chiral phase boundary. Our results may have consequences for the interpretation of the experimental data on net-proton fluctuations in heavy-ion collisions.

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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