A master exceptional field theory
Résumé
We construct a pseudo-Lagrangian that is invariant under rigid E$_{11}$ and transforms as a density under E$_{11}$ generalised diffeomorphisms. The gauge-invariance requires the use of a section condition studied in previous work on E$_{11}$ exceptional field theory and the inclusion of constrained fields that transform in an indecomposable E$_{11}$-representation together with the E$_{11}$ coset fields. We show that, in combination with gauge-invariant and E$_{11}$-invariant duality equations, this pseudo-Lagrangian reduces to the bosonic sector of non-linear eleven-dimensional supergravity for one choice of solution to the section condi- tion. For another choice, we reobtain the E$_{8}$ exceptional field theory and conjecture that our pseudo-Lagrangian and duality equations produce all exceptional field theories with maximal supersymmetry in any dimension. We also describe how the theory entails non-linear equations for higher dual fields, including the dual graviton in eleven dimensions. Furthermore, we speculate on the relation to the E$_{10}$ sigma model.