Abstract
We discuss the dRGT massive gravity interacting with spin-0, spin-1/2, or spin-1 matter. The effective theory of a massive spin-2 particle coupled to matter particles is constructed directly at the amplitude level. In this setting we calculate the gravitational Compton scattering amplitudes and study their UV properties. While the Compton am- plitudes generically grow with energy as O(E6), we identify regions of the parameter space where they are softened to O(E4) or even O(E3), which allows for a larger validity range of the effective theory. In these regions, both positivity and beyond-positivity of the forward Compton amplitudes are fulfilled, and the equivalence principle automatically emerges.
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Falkowski, A., Isabella, G. Matter coupling in massive gravity. J. High Energ. Phys. 2020, 14 (2020). https://doi.org/10.1007/JHEP04(2020)014
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DOI: https://doi.org/10.1007/JHEP04(2020)014