Abstract
The aim of this paper is to clarify the role of the nilpotent fermionic generator Q ′ introduced in [6] and appearing in the hidden supergroup underlying the free differential algebra (FDA) of D=11 supergravity.
We give a physical explanation of its role by looking at the gauge properties of the theory. We find that its presence is necessary, in order that the extra 1-forms of the hidden supergroup give rise to the correct gauge transformations of the p-forms of the FDA. This interpretation is actually valid for any supergravity containing antisymmetric tensor fields, and any supersymmetric FDA can always be traded for a hidden Lie superalgebra containing extra fermionic nilpotent generators.
As an interesting example we construct the hidden superalgebra associated with the FDA of \( \mathcal{N} \) = 2, D = 7 supergravity. In this case we are able to parametrize the mutually non local 2- and 3-form B (2) and B (3) in terms of hidden 1-forms and find that supersymmetry and gauge invariance require in general the presence of two nilpotent fermionic generators in the hidden algebra.
We propose that our approach, where all the invariances of the FDA are expressed as Lie derivatives of the p-forms in the hidden supergroup manifold, could be an appropriate framework to discuss theories defined in enlarged versions of superspace recently considered in the literature, such us double field theory and its generalizations.
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Andrianopoli, L., D’Auria, R. & Ravera, L. Hidden gauge structure of supersymmetric free differential algebras. J. High Energ. Phys. 2016, 95 (2016). https://doi.org/10.1007/JHEP08(2016)095
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DOI: https://doi.org/10.1007/JHEP08(2016)095