Double field theory at order α ′

We investigate α ′ corrections of bosonic strings in the framework of double field theory. The previously introduced “doubled α ′-geometry” gives α ′-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 α ′ 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 α ′ corrections. The usual metric and b -field are related to the duality covariant fields by non-covariant field redefinitions