T-dualization of G?del string cosmologies via Poisson–Lie T-duality approach

摘要

Using the homogeneous G?del spacetimes we find some new solutions for the field equations of bosonic string effective action up to first order in $$lpha '$$ α ′ including both dilaton and axion fields. We then discuss in detail the (non-)Abelian T-dualization of G?del string cosmologies via the Poisson–Lie (PL) T-duality approach. In studying Abelian T-duality of the models we get seven dual models in such a way that they are constructed by one-, two- and three-dimensional Abelian Lie groups acting freely on the target space manifold. The results of our study show that the Abelian T-dual models are, under some of the special conditions, self-dual; moreover, by applying the usual rules of Abelian T-duality without further corrections, we are still able to obtain two-loop solutions. We also study the Abelian T-duality of G?del string cosmologies up to $$lpha '$$ α ′ -corrections by using the T-duality rules at two-loop order derived by Kaloper and Meissner. Afterwards, non-Abelian duals of the G?del spacetimes are constructed by two- and three-dimensional non-Abelian Lie groups such as $$A_2$$ A 2 , $$A_2 oplus A_1$$ A 2 ⊕ A 1 and $$SL(2, mathbb {R})$$ S L ( 2 , R ) . In this way, the PL self-duality of $$AdS_3 imes mathbb {R}$$ A d S 3 × R space is discussed.