全息计量NJL模型：共形窗口与理想行走
Holographic Gauged NJL Model: the Conformal Window and Ideal Walking
摘要：
本文研究了SU（$N_c$）非阿贝尔规范理论的全息动态AdS/QCD描述，其中$N_f$费米子在基本表象中，也包括Nambu-Jona-Lasinio相互作用，使用Witten的多迹处方。特别是在这里，我们研究的动态方面和附近的共形窗口的规范理论所描述的两个循环运行的规范理论。如果味的数目是这样的，红外不动点位于夸克双线性的反常维数$γ$上，那么手征对称性破缺发生。在这里，我们展示了一个在质量夸克凝聚平面上的螺旋，它描述了真空中一系列不稳定的激发态。一个有吸引力的NJL运营商增强真空冷凝，但只有无限排斥NJL相互作用开关完全关闭冷凝。当$N_f$变化，使IR固定点下降到一个（共形窗口区域）以下时，在相结构中存在数值不连续性，仅在超临界NJL相互作用下发生冷凝。在共形窗口中，$γ$向非平凡IR不动点的运动类似于行走动力学，尽管没有触发手征对称性破缺。在“理想行走”的情况下，手征对称性被打破，在红外共形制度的NJL相互作用，但在$γ$的变化增强了紫外冷凝。这种增强的凝聚体中所示的解析模型与急剧变化的$γ$，我们显示了等价的数值结果的情况下，两个循环运行。在该模型中的$σ$成为无质量的规范理论运行成为近共形，我们表明，它是可能实现轻希格斯态理想行走模型。
英文摘要：
We study the holographic Dynamic AdS/QCD description of a SU($N_c$) non-abelian gauge theory with $N_f$ fermions in the fundamental representation which also have Nambu-Jona-Lasinio interactions included using Witten's multi-trace prescription. In particular here we study aspects of the dynamics in and near the conformal window of the gauge theory as described by the two loop running of the gauge theory. If the number of flavours is such that the IR fixed point lies with the anomalous dimension, $γ$, of the quark bilinear above one then chiral symmetry breaking occurs. Here we display a spiral in the mass - quark condensate plane describing a sequence of unstable excited states of the vacuum. An attractive NJL operator enhances the vacuum condensate but only an infinitely repulsive NJL interaction switches off the condensation completely. When $N_f$ changes so that the IR fixed point falls below one (the conformal window region) there is a numerical discontinuity in the phase structure with condensation only occurring with a super critical NJL interaction. In the conformal window, the running of $γ$ to a non-trivial IR fixed point is similar to walking dynamics, although chiral symmetry breaking is not triggered. In the "Ideal Walking" scenario, chiral symmetry is broken in that IR conformal regime by the NJL interaction, but the change in $γ$ enhances the UV condensate. That enhancement of the condensate is shown in an analytic model with a sharp change in $γ$ and we show equivalent numerical results for the case of the two loop running. In the model the $σ$ becomes massless as the gauge theory running becomes near conformal and we show it is possible to realize a light higgs-like state in Ideal Walking models.
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