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Classical integrability and quantum aspects of the AdS\(_3\times S^3\times S^3\times S^1\) superstring. (English) Zbl 1397.81400

Summary: In this paper we continue the investigation of aspects of integrability of the type IIA \(\text{AdS}_3\times S^3\times S^3\times S^1\) and \(\text{AdS}_3\times S^3\times T^4\) superstrings. By constructing a one parameter family of flat connections we prove that the Green-Schwarz string is classically integrable, at least to quadratic order in fermions, without fixing the kappa-symmetry. We then compare the quantum dispersion relation, fixed by integrability up to an unknown interpolating function \(h(\lambda)\), to explicit one-loop calculations on the string worldsheet. For \(\text{AdS}_3\times S^3\times S^3\times S^1\) the spectrum contains heavy, as well as light and massless modes, and we find that the one-loop contribution differs depending on how we treat these modes showing that similar regularization ambiguities as appeared in \(\text{AdS}_4/\text{CFT}_3\) occur also here.

MSC:

81T60 Supersymmetric field theories in quantum mechanics

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