Hull's exotic C-field and its curvature G are reformulated as an ultra-local metric and curvature on loop space.
Supersymmetric action for 6D $(4,0)$ supergravity
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We give a linearized but otherwise complete supersymmetric action for ${\cal N}=(4,0)$ supergravity in six dimensions, using a Kaluza-Klein-type $5+1$ split of coordinates and fields. We provide in particular a significantly simplified version of the bosonic action derived by us recently. This formulation employs fields that are no longer irreducible, subject to a local Lorentz invariance, which in turn simplifies the supersymmetry transformations including the exotic gravitino.
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Exotic gravity theory in loop space
Hull's exotic C-field and its curvature G are reformulated as an ultra-local metric and curvature on loop space.