- Journal Article
Rights / licenseCreative Commons Attribution 4.0 International
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 s2 (“sausage model”) and H2, 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. Show more
Journal / seriesNuclear Physics B
Pages / Article No.
Organisational unit03896 - Beisert, Niklas / Beisert, Niklas
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