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
中科院分区:
文献类型:
--
作者:
Hoare B
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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影响因子:
1.5
作者:
C. Klimčík
通讯作者:
C. Klimčík
影响因子:
3
作者:
L. Castellani
通讯作者:
L. Castellani
影响因子:
5
作者:
E. Abdalla;M. Abdalla;M. Gomes
通讯作者:
M. Gomes
影响因子:
4.4
作者:
C. Hull
通讯作者:
C. Hull
DOI:
10.1016/0550-3213(82)90238-3
发表时间:
1982
期刊:
Nuclear Physics
影响因子:
--
作者:
E. Abdalla;M. Gomes;M. Forger
通讯作者:
M. Forger