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arXiv 1105.4528nucl-thhep-phnucl-ex
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强子-PNJL模型中的Phase diagrams

Phase diagrams in the Hadron-PNJL model

G. Y. Shao, M. Di Toro, V. Greco, M. Colonna, S. Plumari, B. Liu, Y. X. Liu

摘要:

用双状态方程模型描述了重离子碰撞中形成的稠密热物质中的强子-夸克相变。非线性Walecka模型被用来描述强子相。对于夸克相位,Nambu-Jona-Lasinio模型耦合到Polyakov-Loop场(PNJL)被用来包括手征和(去)禁闭动力学。从吉布斯条件导出了相图,并与无约束强子-NJL模型的结果进行了比较。在强子-NJL的情况下,观察到一阶跃迁,但在更高的温度下具有临界终点,限制机制的结果,减少了接近相变的夸克物质的自由度。特别注意的是致力于相变的同位旋不对称物质。有趣的同位旋效应在重子密度和约化温度下被发现,事实上这也是其他夸克模型,如MIT-Bag和NJL模型所共有的。提出了一些可能的观测信号,以探索中能重离子碰撞(HIC)实验。

英文摘要:

The two-Equation of State (Two-EoS) model is used to describe the hadron-quark phase transition in dense-hot matter formed in heavy-ion collisions. The non-linear Walecka model is used to describe the hadronic phase. For the quark phase, the Nambu--Jona-Lasinio model coupled to Polyakov-Loop fields (PNJL) is used to include both the chiral and (de)confinement dynamics. The phase diagrams are derived from the Gibbs conditions and compared with the results obtained in the Hadron-NJL model without confinement. As in the Hadron-NJL case a first order transition is observed, but with a Critical-End-Point at much higher temperature, consequence of the confinement mechanism that reduces the degrees of freedom of the quark matter in proximity of the phase transition. Particular attention is devoted to the phase transition in isospin asymmetric matter. Interesting isospin effects are found at high baryon density and reduced temperatures, in fact common also to other quark models, like MIT-Bag and NJL model. Some possible observation signals are suggested to probe in Heavy-Ion Collision (HIC) experiments at intermediate energies.

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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