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arXiv 2301.01465hep-ph
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热磁背景下(2+1)味Nambu-Jona-Lasinio模型中的自旋极化与反常磁矩

Spin Polarization and Anomalous Magnetic Moment in a (2 + 1)-flavor Nambu-Jona-Lasinio model in a thermomagnetic background

Yi-Wei Qiu, Sheng-Qin Feng

AI总结:

本文在有限温度和化学势下,通过比较夸克的张量自旋极化(TSP)与反常磁矩(AMM)对(2+1)味NJL模型中手性相变的影响,发现TSP增强磁催化而AMM引发逆磁催化并改变轻夸克相变级数。

摘要:

我们通过比较夸克的张量自旋极化(TSP)与反常磁矩(AMM)的贡献,研究了有限温度和化学势下(2+1)味Nambu-Jona-Lasinio(NJL)模型中的磁化QCD物质及手性相变。对于轻夸克u和d,当不考虑TSP和AMM时,磁化系统表现为磁催化特征。引入TSP会进一步增强磁催化特性。另一方面,当引入AMM时,相变温度随磁场降低,这是逆磁催化的特征。当引入AMM时,随磁场和化学势增加,u和d夸克的相图将从平滑过渡转变为一级相变。引入TSP时,相图不会从平滑过渡转变为一级相变。对于奇异夸克s的相图,无论引入TSP还是AMM,随磁场和化学势增加,相图都将保持平滑过渡。

英文摘要:

We investigate the magnetized QCD matter and chiral phase transition in a (2 þ 1)-flavor Nambu-Jona-Lasinio (NJL) model at finite temperature and chemical potential by comparing the contributions from the tensor spin polarization (TSP) and anomalous magnetic moment (AMM) of quarks. For light u and d quarks, when TSP and AMM are not considered, the magnetized system is characterized by magnetic catalysis. The introduction of TSP will further enhance the magnetic catalytic characteristics. On the other hand, when AMM is introduced, the phase-transition temperature decreases with the magnetic field, which is the feature of inverse magnetic catalysis. The phase diagram of u and d quarks will change from the crossover phase transition to the first order phase transition with the increase of magnetic field and chemical potential when AMM is induced. The phase diagram will not change from the crossover phase transition to the first-order phase transition when TSP is induced. For the phase diagram of strange s quark, whether TSP or AMM is induced, the phase diagram will keep a crossover phase transition with the increase of magnetic field and chemical potential.

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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