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Scale invariance of the \(\eta\)-deformed \(\mathrm{AdS}_{5} \times S^{5}\) superstring, T-duality and modified type II equations. (English) Zbl 1332.81167
Summary: We consider the ABF background underlying the \(\eta\)-deformed \(\mathrm{AdS}_5 \times S^5\) sigma model. This background fails to satisfy the standard IIB supergravity equations which indicates that the corresponding sigma model is not Weyl invariant, i.e. does not define a critical string theory in the usual sense. We argue that the ABF background should still define a UV finite theory on a flat 2d world-sheet implying that the \(\eta\)-deformed model is scale invariant. This property follows from the formal relation via T-duality between the \(\eta\)-deformed model and the one defined by an exact type IIB supergravity solution that has 6 isometries albeit broken by a linear dilaton. We find that the ABF background satisfies candidate type IIB scale invariance conditions which for the R-R field strengths are of the second order in derivatives. Surprisingly, we also find that the ABF background obeys an interesting modification of the standard IIB supergravity equations that are first order in derivatives of R-R fields. These modified equations explicitly depend on Killing vectors of the ABF background and, although not universal, they imply the universal scale invariance conditions. Moreover, we show that it is precisely the non-isometric dilaton of the T-dual solution that leads, after T-duality, to modification of type II equations from their standard form. We conjecture that the modified equations should follow from \(\kappa\)-symmetry of the \(\eta\)-deformed model. All our observations apply also to \(\eta\)-deformations of \(\mathrm{AdS}_3 \times S^3 \times T^4\) and \(\mathrm{AdS}_2 \times S^2 \times T^6\) models.

MSC:
81T30 String and superstring theories; other extended objects (e.g., branes) in quantum field theory
81T60 Supersymmetric field theories in quantum mechanics
81T20 Quantum field theory on curved space or space-time backgrounds
83E50 Supergravity
14D15 Formal methods and deformations in algebraic geometry
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