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Starting from the eleven dimensional E_{11} non-linear realisation ofM-theory we compute all possible forms, that is objects with totallyantisymmetrised indices, that occur in four dimensions and above as well as allthe 1-forms and 2-forms in three dimensions. In any dimension D, the D-1-formslead to maximal supergravity theories with cosmological constants and they arein precise agreement with the patterns of gauging found in any dimension usingsupersymmetry. The D-forms correspond to the presence of space-filling braneswhich are crucial for the consistency of orientifold models and have not beenderived from an alternative approach, with the exception of the 10-dimensionalcase. It follows that the gaugings of supergravities and the spacetime-fillingbranes possess an eleven dimensional origin within the E_{11} formulation ofM-theory. This and previous results very strongly suggest that all the fieldsin the adjoint representation of E_{11} have a physical interpretation.

The E_{11} origin of all maximal supergravities