Abstract
We construct the first complete exceptional field theory that is based on an infinite-dimensional symmetry group. E9 exceptional field theory provides a unified description of eleven-dimensional and type IIB supergravity covariant under the affine Kac-Moody symmetry of two-dimensional maximal supergravity. We present two equivalent formulations of the dynamics, which both rely on a pseudo-Lagrangian supplemented by a twisted self-duality equation. One formulation involves a minimal set of fields and gauge symmetries, which uniquely determine the entire dynamics. The other formulation extends \( {\mathfrak{e}}_9 \) by half of the Virasoro algebra and makes direct contact with the integrable structure of two-dimensional supergravity. Our results apply directly to other affine Kac-Moody groups, such as the Geroch group of general relativity.
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Bossard, G., Ciceri, F., Inverso, G. et al. E 9 exceptional field theory. Part II. The complete dynamics. J. High Energ. Phys. 2021, 107 (2021). https://doi.org/10.1007/JHEP05(2021)107
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DOI: https://doi.org/10.1007/JHEP05(2021)107