The QCD phase diagram for external magnetic fields
The QCD phase diagram for external magnetic fields
复制标题
DOI：
10.1007/jhep02(2012)044
复制
发表时间：
2011-11
影响因子：
5.4
通讯作者：
G. Bali;F. Bruckmann;G. Endrődi;Z. Fodor;Z. Fodor;S. Katz;S. Krieg;A. Schäfer;K. Szabó
中科院分区：
文献类型：
--
作者：
G. Bali;F. Bruckmann;G. Endrődi;Z. Fodor;Z. Fodor;S. Katz;S. Krieg;A. Schäfer;K. Szabó
研究了外加（电）磁场对QCD有限温度跃迁的影响。我们生成配置在不同的值的量子化磁通量与N f= 2+ 1口味的粗壮的涂抹交错夸克，物理质量。热力学观测量，包括手征凝聚和磁化率，和奇怪的夸克数磁化率作为场强的函数进行测量。我们进行重整化的研究观察和外推的结果，连续极限使用NT = 6，8和10格。我们还检查有限体积效应使用各种晶格体积。我们发现，从我们所有的观察到的转变温度TC显着降低，随着磁场的增加。这与预测增加的Tc（B）的各种模型计算相冲突。从有限体积标度分析，我们发现，目前在B= 0的解析交叉持续到我们最大的磁场EB <$1 GeV 2，和过渡强度增加温和到这个EB <$1 GeV 2。
The effect of an external (electro) magnetic field on the finite temperature transition of QCD is studied. We generate configurations at various values of the quantized magnetic flux with N f= 2+ 1 flavors of stout smeared staggered quarks, with physical masses. Thermodynamic observables including the chiral condensate and susceptibility, and the strange quark number susceptibility are measured as functions of the field strength. We perform the renormalization of the studied observables and extrapolate the results to the continuum limit using N t= 6, 8 and 10 lattices. We also check for finite volume effects using various lattice volumes. We find from all of our observables that the transition temperature T c significantly decreases with increasing magnetic field. This is in conflict with various model calculations that predict an increasing T c (B). From a finite volume scaling analysis we find that the analytic crossover that is present at B= 0 persists up to our largest magnetic fields eB≈ 1 GeV 2, and that the transition strength increases mildly up to this eB≈ 1 GeV 2.