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arXiv 1111.4956hep-lathep-ph
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QCD phase diagram适用于外部磁场

The QCD phase diagram for external magnetic fields

G. S. Bali, F. Bruckmann, G. Endrodi, Z. Fodor, S. D. Katz, S. Krieg, A. Schafer, K. K. Szabo

摘要:

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$N_t=6,8$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,从我们所有的可观察到的转变温度$T_c$显着降低,随着磁场的增加。这与预测$T_c(B)$增加的各种模型计算相冲突。从有限体积标度分析中,我们发现在B=0处存在的解析交叉持续到我们最大的磁场$eB \approx 1 \textmd{GeV}^2$,并且过渡强度温和地增加到这个$eB\approx1 \textmd{GeV}^2$。

英文摘要:

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 $eB \approx 1 \textmd{GeV}^2$, and that the transition strength increases mildly up to this $eB\approx1 \textmd{GeV}^2$.

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