Yang-Baxter Deformations Beyond Coset Spaces (a slick way to do TsT)

Abstract

Yang-Baxter string sigma-models provide a systematic way to deform coset geometries, such as $Ad{S}_p\times S^p$, while retaining the $\sigma$-model integrability. It has been shown that the Yang-Baxter deformation in target space is simply an open-closed string map that can be defined for any geometry, not just coset spaces. Given a geometry with an isometry group and a bivector that is assumed to be a linear combination of antisymmetric products of Killing vectors, we show the equations of motion of (generalized) supergravity reduce to the Classical Yang-Baxter Equation associated with the isometry group, proving the statement made in [1]. These results bring us closer to the proof of the "YB solution generating technique" for (generalized) supergravity advertised in [1] and in particular provide an economical way to perform TsT transformations.

arXiv comment33 pages; v2 typos fixed and reference added; v3 further improvements in text, matches published version; v4 typo in expression for B (4.9) corrected

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