2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/191789We calculate the background field equations for the T-duality symmetric string building on previous work by including the effect of the Dilaton up to two-loops. Inclusion of the Dilaton allows us to obtain the full beta functionals of the duality symmetric sigma model. We are able to interpret the result in terms of a dimensionally reduced O(d,d) invariant target space effective action.15 pages, latex; v2 reference added, typos fixedHigh Energy Physics - Theorytext