Abstract
We detail the construction of the exceptional sigma model, which describes a string propagating in the “extended spacetime” of exceptional field theory. This is to U-duality as the doubled sigma model is to T-duality. Symmetry specifies the Weylinvariant Lagrangian uniquely and we show how it reduces to the correct 10-dimensional string Lagrangians. We also consider the inclusion of a Fradkin-Tseytlin (or generalised dilaton) coupling as well as a reformulation with dynamical tension.
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Arvanitakis, A.S., Blair, C.D.A. The exceptional sigma model. J. High Energ. Phys. 2018, 64 (2018). https://doi.org/10.1007/JHEP04(2018)064
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DOI: https://doi.org/10.1007/JHEP04(2018)064