Abstract
Conformal supergravity amplitudes are obtained from the double-copy construction using gauge-theory amplitudes, and compared to direct calculations starting from conformal supergravity Lagrangians. We consider several different theories: minimal \( \mathcal{N}=4 \) conformal supergravity, non-minimal \( \mathcal{N}=4 \) Berkovits-Witten conformal supergravity, mass-deformed versions of these theories, as well as supersymmetry truncations thereof. Coupling the theories to a Yang-Mills sector is also considered. For all cases we give the gravity Lagrangians that the double copy implicitly generates. The two main results are: we determine a Lagrangian for the non-minimal Berkovits-Witten theory, and we uncover the double-copy prescription for the minimal \( \mathcal{N}=4 \) conformal supergravity.
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Johansson, H., Mogull, G. & Teng, F. Unraveling conformal gravity amplitudes. J. High Energ. Phys. 2018, 80 (2018). https://doi.org/10.1007/JHEP09(2018)080
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DOI: https://doi.org/10.1007/JHEP09(2018)080