Thermo-magnetic effects in quark matter: Nambu-Jona-Lasinio model constrained by lattice QCD
Thermo-magnetic effects in quark matter: Nambu-Jona-Lasinio model constrained by lattice QCD
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DOI：
10.1140/epja/i2017-12320-8
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
R. Farias;V. Timóteo;S. Avancini;M. B. Pinto;G. Krein
中科院分区：
文献类型：
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作者：
R. Farias;V. Timóteo;S. Avancini;M. B. Pinto;G. Krein
如果Nambu-Jona-Lasinio模型的耦合G随磁场强度B和温度T的增大而减小，则晶格模拟预言的QCD手征对称性的逆磁催化现象在该模型中可以重现。通过拟合最近的格点QCD预言，得到了G（B，T）的热磁依赖性。用G（B，T）计算了磁化夸克物质的不同热力学量，并与常耦合下G（B，T）的结果进行了比较。G（B，T）模型预测随着电场强度的增加，手征跃迁更加剧烈.此外，对于给定的温度，压强和磁化强度总是随着B的增加而增加。通过四个磁场相关系数的参数化和具有一个相当简单的指数热依赖性，我们的耦合常数的准确的计算可以很容易地实现，以改善典型的模型磁化夸克物质的应用。
The phenomenon of inverse magnetic catalysis of chiral symmetry in QCD predicted by lattice simulations can be reproduced within the Nambu-Jona-Lasinio model if the couplingGof the model decreases with the strengthBof the magnetic field and temperatureT. The thermo-magnetic dependence ofG(B,T) is obtained by fitting recent lattice QCD predictions for the chiral transition order parameter. Different thermodynamic quantities of magnetized quark matter evaluated withG(B,T) are compared with the ones obtained at constant coupling,G. The model withG(B,T) predicts a more dramatic chiral transition as the field intensity increases. In addition, the pressure and magnetization always increase withBfor a given temperature. Being parametrized by four magnetic-field-dependent coefficients and having a rather simple exponential thermal dependence our accurate ansatz for the coupling constant can be easily implemented to improve typical model applications to magnetized quark matter.