Integrable sigma models and 2-loop RG flow

Integrable sigma models and 2-loop RG flow
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可积分 sigma 模型和 2 环 RG 流

DOI:
10.1007/jhep12(2019)146
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发表时间:
2019
影响因子:
5.4
通讯作者:
Hoare B
Hoare B
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hoare B

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关于arXiv:1907.04737,我们继续研究了二维σ-模型的可重正化性(有许多耦合)与可积性之间的关系.我们专注于“λ-模型”,一个可积模型与一个群或对称空间,并包含作为特殊限制(规范)WZW模型和“插值模型”的非阿贝尔对偶。参数是WZ能级k和耦合λ,场是g,取值于群G,以及对应代数中的2d向量A±。我们将λ-模型表示为扩展的G× G× G位形空间(g,h,)上的σ-模型,定义h和通过A+= h + h− 1,A_= h − 1.我们的主要观察是,这个扩展的位形空间上的模型是可重整化的,没有任何变形,只有λ运行。这与标准σ-模型相反,标准σ-模型通过积分A±得到,其2-圈重整化只能在添加特定的有限局域反项后获得,导致目标空间几何的量子变形。我们计算了一般群和对称空间中λ-模型的2-loop β-函数,并以SU(2)/U(1)和SU(2)为例说明了我们的结果.类似的结论适用于非阿贝尔对偶极限,这意味着非阿贝尔对偶与RG流交换。我们还找到了“压扁”主手征模型的双环β函数。
Following arXiv: 1907.04737, we continue our investigation of the relation between the renormalizability (with finitely many couplings) and integrability in 2d σ-models. We focus on the “λ-model,” an integrable model associated to a group or symmetric space and containing as special limits a (gauged) WZW model and an “interpolating model” for non-abelian duality. The parameters are the WZ level k and the coupling λ, and the fields are g, valued in a group G, and a 2d vector A±in the corresponding algebra. We formulate the λ-model as a σ-model on an extended G× G× G configuration space (g, h,), defining h andby A+= h∂+ h− 1, A_=∂−− 1. Our central observation is that the model on this extended configuration space is renormalizable without any deformation, with only λ running. This is in contrast to the standard σ-model found by integrating out A±, whose 2-loop renormalizability is only obtained after the addition of specific finite local counterterms, resulting in a quantum deformation of the target space geometry. We compute the 2-loop β-function of the λ-model for general group and symmetric spaces, and illustrate our results on the examples of SU (2)/U (1) and SU (2). Similar conclusions apply in the non-abelian dual limit implying that non-abelian duality commutes with the RG flow. We also find the 2-loop β-function of a “squashed” principal chiral model.
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