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arXiv 1907.04737hep-th
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可积二维西格玛模型:从RG流对几何的量子修正

Integrable 2d sigma models: quantum corrections to geometry from RG flow

Ben Hoare, Nat Levine, Arkady A. Tseytlin

摘要:

经典可积的$σ$ -模型已知是单回路RG方程或“Ricci流”的解,其中仅运行几个耦合。在一些最简单的可积变形的例子中,我们发现,为了在2(和更高)圈时保持这种性质,经典的$σ$模型应该用量子反项来校正。该模式类似于有效的$σ$ -与规范WZW理论相关的模型。我们考虑详细的例子$η$ -变形的$S^2$(“香肠模型”)和$H^2$,以及密切相关的$λ$ -变形的$SO(1,2)/SO(2)$陪集。我们还指出,类似的counterterterms所需的,以使非阿贝尔对偶与RG流超越1-loop的顺序。

英文摘要:

Classically integrable $σ$-models are known to be solutions of the 1-loop RG equations, or "Ricci flow", with only a few couplings running. In some of the simplest examples of integrable deformations we find that in order to preserve this property at 2 (and higher) loops the classical $σ$-model should be corrected by quantum counterterms. The pattern is similar to that of effective $σ$-models associated to gauged WZW theories. We consider in detail the examples of the $η$-deformation of $S^2$ ("sausage model") and $H^2$, as well as the closely related $λ$-deformation of the $SO(1,2)/SO(2)$ coset. We also point out that similar counterterms are required in order for non-abelian duality to commute with RG flow beyond the 1-loop order.

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