Abstract
We elaborate on the class of deformed T-dual (DTD) models obtained by first adding a topological term to the action of a supercoset sigma model and then performing (non-abelian) T-duality on a subalgebra \( \tilde{\mathfrak{g}} \) of the superisometry algebra. These models inherit the classical integrability of the parent one, and they include as special cases the so-called homogeneous Yang-Baxter sigma models as well as their non-abelian T-duals. Many properties of DTD models have simple algebraic interpretations. For example we show that their (non-abelian) T-duals — including certain deformations — are again in the same class, where \( \tilde{\mathfrak{g}} \) gets enlarged or shrinks by adding or removing generators corresponding to the dualised isometries. Moreover, we show that Weyl invariance of these models is equivalent to \( \tilde{\mathfrak{g}} \) being unimodular; when this property is not satisfied one can always remove one generator to obtain a unimodular \( \tilde{\mathfrak{g}} \), which is equivalent to (formal) T-duality. We also work out the target space superfields and, as a by-product, we prove the conjectured transformation law for Ramond-Ramond (RR) fields under bosonic non-abelian T-duality of supercosets, generalising it to cases involving also fermionic T-dualities.
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Borsato, R., Wulff, L. On non-abelian T-duality and deformations of supercoset string sigma-models. J. High Energ. Phys. 2017, 24 (2017). https://doi.org/10.1007/JHEP10(2017)024
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DOI: https://doi.org/10.1007/JHEP10(2017)024