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arXiv 2512.23934nucl-th
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Polyakov环扩展Nambu-Jona-Lasinio模型中温度波动研究

Fluctuations of Temperature in the Polyakov-loop extended Nambu--Jona-Lasinio Model

Qingdao University of Technology(青岛理工大学);The Research Center of Theoretical Physics, Qingdao University of Technology(青岛理工大学理论物理研究中心)

He Liu, Peng Wu, Hong-Ming Liu, Peng-Cheng Chu

AI总结:

本文基于3味Polyakov环扩展Nambu-Jona-Lasinio模型研究高温QCD物质中温度波动,发现高阶累积比在临界点附近出现非单调波动,与脱困相变相关。

摘要:

我们利用3味Polyakov环扩展Nambu-Jona-Lasinio模型研究高温QCD物质中的温度波动。高阶累积比R_{n2}(n>2)在反常相变中表现出非单调变化,特征为在反常区域有轻微波动,在临界点附近有显著振荡。相比之下,低重子化学势下累积比显示出明显的峰和谷结构,这些结构在高化学势下逐渐减弱并消失,因为它们与反常相变的尖锐化竞争,特别是在临界点和一级相变附近。我们的结果表明,高阶累积比中的非单调峰和谷结构与脱困相变有关。本研究定量分析了不同相变区域中的温度波动行为,预期可通过重离子碰撞实验测量事件间横向动量波动来验证这些发现。

英文摘要:

We investigate temperature fluctuations in hot QCD matter using a 3-flavor Polyakov-loop extended Nambu--Jona-Lasinio (PNJL) model. The high-order cumulant ratios $R_{n2}$ ($n>2$) exhibit non-monotonic variations across the chiral phase transition, characterized by slight fluctuations in the chiral crossover region and significant oscillations around the critical point. In contrast, distinct peak and dip structures are observed in the cumulant ratios at low baryon chemical potential. These structures gradually weaken and eventually vanish at high chemical potential as they compete with the sharpening of the chiral phase transition, particularly near the critical point and the first-order phase transition. Our results indicate that these non-monotonic peak and dip structures in high-order cumulant ratios are associated with the deconfinement phase transition. This study quantitatively analyzes temperature fluctuation behavior across different phase transition regions, and the findings are expected to be observed and validated in heavy-ion collision experiments through measurements of event-by-event mean transverse momentum fluctuations.

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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