Abstract
We prove in two ways that, for a special class of nonlocal field theories consistent with linear and non-linear stability at the classical level, and with unitarity and super-renormalizability or finiteness at the quantum level, the n-point tree-level scattering amplitudes are the same as those of the underlying local theory. In particular, the n-point amplitudes of nonlocal gravity, with or without coupling to matter, are the same as for Einstein’s general relativity.
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Modesto, L., Calcagni, G. Tree-level scattering amplitudes in nonlocal field theories. J. High Energ. Phys. 2021, 169 (2021). https://doi.org/10.1007/JHEP10(2021)169
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DOI: https://doi.org/10.1007/JHEP10(2021)169