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arXiv 1208.4382hep-phhep-lat
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两个输入来自格点量子色动力学的Nambu-Jona-Lasinio型模型的性质

Some properties of two Nambu--Jona-Lasinio -type models with inputs from lattice QCD

P. Costa, C. A. de Sousa, M. C. Ruivo, H. Hansen, O. Oliveira, P. J. Silva

摘要:

本文研究了在有限温度和非零化学势下的Polyakov-Nambu-Jona-Lasinio(PNJL)模型的相图。计算是在轻夸克和奇异夸克扇区($u$,$d$,$s$)中进行的,其中包含了破坏轴对称的't Hooft瞬子诱导相互作用项,夸克耦合到(空间恒定的)时间背景规范场.一方面,特别关注临界终点(CEP)。风味混合相互作用的强度改变了CEP的位置,因为当它变得较弱时,CEP会向低温移动,甚至消失。另一方面,我们也探讨了量子色动力学、非定域Nambu-Jona-Lasinio模型和朗道规范胶子传播子之间的联系。研究了猝灭胶子传播子与低能强子现象之间的可能联系。

英文摘要:

We investigate the phase diagram of the so-called Polyakov--Nambu--Jona-Lasinio (PNJL) model at finite temperature and nonzero chemical potential. The calculations are performed in the light and strange quark sectors ($u$, $d$, $s$), which includes the 't Hooft instanton induced interaction term that breaks the axial symmetry, and the quarks are coupled to the (spatially constant) temporal background gauge field. On one hand, a special attention is payed to the critical end point (CEP). The strength of the flavor-mixing interaction alters the CEP location, since when it becomes weaker the CEP moves to low temperatures and can even disappear. On the other hand, we also explore the connection between QCD, a nonlocal Nambu--Jona-Lasinio type model and the Landau gauge gluon propagator. Possible links between the quenched gluon propagator and low energy hadronic phenomenology are investigated.

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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