Dressed Polyakov loop and phase diagram of hot quark matter in a magnetic field
Dressed Polyakov loop and phase diagram of hot quark matter in a magnetic field
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DOI：
10.1103/physrevd.82.054027
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发表时间：
2010-07
影响因子：
5
通讯作者：
R. Gatto;M. Ruggieri
中科院分区：
文献类型：
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作者：
R. Gatto;M. Ruggieri
我们评估了强磁场中热夸克物质的修饰波利亚科夫环。为了计算有限温度有效势，我们使用 Polyakov 扩展 Nambu-Jona-Lasinio 模型，并考虑了八夸克相互作用。调整裸夸克质量以再现真空π介子质量的物理值。我们的结果表明，修饰的波利亚科夫环对磁场强度非常敏感，并且能够捕获去约束交叉和手性交叉。此外，我们自洽地计算了模型的相图。随着磁场强度的增加，我们发现上述两个交叉点出现了微小的分裂。具体而言，对于此处研究的磁场最大值 eB=19m{sub {pi}}{sup 2}，分裂约为 10%。还与其他有效模型和最近的晶格结果进行了定性比较。
We evaluate the dressed Polyakov loop for hot quark matter in strong magnetic field. To compute the finite temperature effective potential, we use the Polyakov extended Nambu-Jona-Lasinio model with eight-quark interactions taken into account. The bare quark mass is adjusted in order to reproduce the physical value of the vacuum pion mass. Our results show that the dressed Polyakov loop is very sensitive to the strength of the magnetic field, and it is capable to capture both the deconfinement crossover and the chiral crossover. Additionally, we self-consistently compute the phase diagram of the model. We find a tiny split of the two aforementioned crossovers as the strength of the magnetic field is increased. Concretely, for the largest value of magnetic field investigated here, eB=19m{sub {pi}}{sup 2}, the split is of the order of 10%. A qualitative comparison with other effective models and recent lattice results is also performed.