Dynamic AdS/QCD and the spectrum of walking gauge theories
Dynamic AdS/QCD and the spectrum of walking gauge theories
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DOI：
10.1103/physrevd.88.105016
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发表时间：
2013-07
影响因子：
5
通讯作者：
T. Alho;N. Evans;K. Tuominen
中科院分区：
文献类型：
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作者：
T. Alho;N. Evans;K. Tuominen
我们提出了一个简单的AdS/QCD模型，其中手性凝聚体的形成是动态确定的。规范动力学是通过夸克双线性的反常维数？的运行来输入的。在介子束缚态质量和衰变常数的计算中，凝聚体提供了一个动态产生的红外墙。作为一个例子，我们使用的模型，与微扰计算的运行？，研究具有连续数量的夸克味Nf的SU（3）规范理论。我们遵循的频谱的行为，因为我们接近共形窗口通过步行规范理论制度。我们表明，这样的步行理论显示Berezinskiii-Kosterlitz-Alkles相变，与Miransky缩放，作为一个方法的边缘的共形窗口的临界值NF。我们表明，这些步行理论具有增强的夸克凝聚，轻希格斯激发，并认为非微扰的贡献S福尔斯下降到零。我们还研究了当夸克具有当前质量时Berezinskiii-Kosterlitz-Escherles跃迁的变形，这可能有助于理解行走理论的晶格模拟。
We present a simple AdS/QCD model in which the formation of the chiral condensate is dynamically determined. The gauge dynamics is input through the running of the quark bilinear’s anomalous dimension, ?. The condensate provides a dynamically generated infrared wall in the computation of mesonic bound state masses and decay constants. As an example, we use the model, with perturbative computations of the running of ?, to study SU(3) gauge theory with a continuous number of quark flavors, Nf. We follow the behavior of the spectrum as we approach the conformal window through a walking gauge theory regime. We show such walking theories display a Berezinskii–Kosterlitz–Thoules phase transition, with Miransky scaling, as one approaches the edge of the conformal window at the critical value of Nf. We show that these walking theories possess an enhanced quark condensate, a light Higgs-like excitation, and argue that the nonperturbative contribution to S falls to zero. We also study the deformation of the Berezinskii–Kosterlitz–Thoules transition when the quarks have a current mass, which may be of use for understanding lattice simulations of walking theories.