In this paper we present cosmological solutions of double field theory in the supergravity frame and in the winding frame which are related via T-duality. In particular, we show that the solutions can be viewed without the need of complexifying the cosmological scale factor.
Bernardo, H., Brandenberger, R., & Franzmann, G. (2019). T-dual cosmological solutions in double field theory. II. Physical Review D, 99(6), 063521.