Gauged double field theory as an L ∞ algebra

Abstract L ∞ algebras describe the underlying algebraic structure of many consistent classical field theories. In this work we analyze the algebraic structure of Gauged Double Field Theory in the generalized flux formalism. The symmetry transformations consist of a generalized deformed Lie derivative and double Lorentz transformations. We obtain all the non-trivial products in a closed form considering a generalized Kerr-Schild ansatz for the generalized frame and we include a linear perturbation for the generalized dilaton. The off-shell structure can be cast in an L 3 algebra and when one considers dynamics the former is exactly promoted to an L 4 algebra. The present computations show the fully algebraic structure of the fundamental charged heterotic string and the L 3 gauge $$ {L}_3^{\mathrm{gauge}} $$ structure of (Bosonic) Enhanced Double Field Theory