The bulk transition of QCD with twelve flavors and the role of improvement
The bulk transition of QCD with twelve flavors and the role of improvement
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十二种口味QCD的批量转变及改进作用
DOI：
10.1016/j.physletb.2013.02.030
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发表时间：
2012
影响因子：
4.4
通讯作者：
E. Pallante
中科院分区：
文献类型：
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作者：
A. Deuzeman;M. Lombardo;T. Silva;E. Pallante
我们通过使用交错费米子的晶格模拟来研究基本表示中具有 Nf=12 风格的 SU(3) 规范理论。通过未改进的作用，我们观察到手性零温度（体）转变将实现手性对称性的弱耦合区域与手性对称性被破坏的强耦合区域分开。随着动作的改进，出现了更复杂的模式，特别是手性极限中出现了两个一阶跃迁。我们观察到，在足够强的耦合下，改进的晶格作用的次近邻项不再无关紧要，并且确实可以修改观察到的模式而无需改进。重子数守恒可以通过一种不寻常的方式实现，从而允许赝标量通道中存在否则禁止的振荡项。我们通过借用统计力学的明确例子来讨论这一现象。最后，这些观察结果在模拟晶格上的其他强耦合系统（例如石墨烯）时也很有用。
We study the SU(3) gauge theory with Nf=12 flavors in the fundamental representation by use of lattice simulations with staggered fermions. With a non-improved action we observe a chiral zero-temperature (bulk) transition separating a region at weak coupling, where chiral symmetry is realized, from a region at strong coupling where chiral symmetry is broken. With improved actions, a more complicated pattern emerges, and in particular two first order transitions in the chiral limit appear. We observe that at sufficiently strong coupling the next-to-nearest neighbor terms of the improved lattice action are no longer irrelevant and can indeed modify the pattern observed without improvement. Baryon number conservation can be realized in an unusual way, allowing for an otherwise prohibited oscillating term in the pseudoscalar channel. We discuss the phenomenon by means of explicit examples borrowed from statistical mechanics. Finally, these observations can also be useful when simulating other strongly coupled systems on the lattice, such as graphene.
共形相变和大 Nf QCD
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
S.Matsumoto;M.M. Nojiri;D.Nomura;山脇幸一
通讯作者：
山脇幸一