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Roiban, The SAGEX Review on Scattering Amplitudes, Chapter 2: An Invitation to Color-Kinematics Duality and the Double Copy, arXiv:2203.13013, 2022","review_link":"https://arxiv.org/abs/2203.13013","review_verified":"true","summary":"Gravity scattering can be computed by squaring gluon scattering (the particles of the strong force), once the gluon formulas are written in a special form. Whether this squaring works at every loop order and for exact, non-perturbative solutions is unknown.","title":"Double copy beyond tree level and perturbation theory","topic_ref":null,"why":"If the relation holds in general, gravity calculations, from gravitational-wave templates to the ultraviolet behavior of supergravity, reduce to much simpler gauge-theory 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