The dual graviton was first hypothesized in 1980. It was theoretically modeled in 2000s, which was then predicted in eleven-dimensional mathematics of SO(8) supergravity in the framework of electric-magnetic duality. It again emerged in the E11 generalized geometry in eleven dimensions, and the E7 generalized vielbein-geometry in eleven dimensions. While there is no local coupling between graviton and dual graviton, the field introduced by dual graviton may be coupled to a BF model as non-local gravitational fields in extra dimensions.
A massive dual gravity of Ogievetsky-Polubarinov model can be obtained by coupling the dual graviton field to the curl of its own energy-momentum tensor.
The previously mentioned theories of dual graviton are in flat space. In de Sitter and anti-de Sitter spaces (A)dS, the massless dual graviton exhibits less gauge symmetries dynamics compared with those of Curtright field in flat space, hence the mixed-symmetry field propagates in more degrees of freedom. However, the dual graviton in (A)dS transforms under GL(D) representation, which is identical to that of massive dual graviton in flat space. This apparent paradox can be resolved using the unfolding technique in Brink, Metsaev, and Vasiliev conjecture. For the massive dual graviton in (A)dS, the flat limit is clarified after expressing dual field in terms of the Stueckelberg coupling of a massless spin-2 field with a Proca field.
Dual linearized gravity
The dual formulations of linearized gravity are described by a mixed Young symmetry tensor , the so-called dual graviton, in any spacetime dimension D > 4 with the following characters:
where square brackets show antisymmetrization.
For 5-D spacetime, the spin-2 dual graviton is described by the Curtright field. The symmetry properties imply that
In similar manner while we define gravitomagnetic and gravitoelectic for the graviton, we can define electric and magnetic fields for the dual graviton. There are the following relation between the gravitoelectic field and gravitomagnetic field of the graviton and the gravitoelectic field and gravitomagnetic field of the dual graviton :
where is the Weyl tensor in D = 6. The free (4,0) conformal gravity can be reduced to the graviton in the ordinary space, and the dual graviton in the dual space in D = 4.
It is easy to notice the similarity between the Lanczos tensor, that generates the Weyl tensor in geometric theories of gravity, and Curtright tensor, particularly their shared symmetry properties of the linearized spin connection in Einstein's theory. However, Lanczos tensor is a tensor of geometry in D=4, meanwhile Curtright tensor is a field tensor in arbitrary dimensions.
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