Double field theory at order α′

We investigate alpha ' corrections of bosonic strings in the framework of double field theory. The previously introduced doubled alpha '-geometry gives alpha '-deformed gauge transformations arising in the Green-Schwarz anomaly cancellation mechanism but does not apply to bosonic strings. These require a different deformation of the duality-covariantized Courant bracket which governs the gauge structure. This is revealed by examining the alpha ' corrections in the gauge algebra of closed string field theory. We construct a four-derivative cubic double field theory action invariant under the deformed gauge transformations, giving a first glimpse of the gauge principle underlying bosonic string alpha ' corrections. The usual metric and b-field are related to the duality covariant fields by non-covariant field redefinitions.