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The double copy as a doppelg\"{a}nger
Nathan Moynihan, Michael L. Reichenberg Ashby, Chris D. White
https://arxiv.org/abs/2509.22350 https://arxiv.org…

The double copy as a doppelgänger
The double copy relates scattering amplitudes and classical solutions in non-abelian gauge theories and gravity. As such, it is usually expressed in the conventional second-order formalisms in both theories corresponding to standard Yang-Mills theory, and the Einstein--Hilbert action in General Relativity. In this paper, we instead consider alternative formulations of gravity, which are known to terminate at finite order in the coupling at Lagrangian level. We focus in particular on the Chern--…