The theory says that scattering amplitudes in non-Abelian gauge theories can be factorized such that replacement of the color factor by additional kinematic dependence factor, in a well-defined way, automatically leads to gravity scattering amplitudes.
It was first written down by Zvi Bern, John Joseph Carrasco and Henrik Johansson in 2010 [1] and was sometimes known as the BCJ duality after its creators[2] or as "gravity = gauge × gauge".
[3] The theory can be used to make calculations of gravity scattering amplitudes simpler by instead calculating the Yang–Mills amplitude and following the double copy prescription.
[4] This technique has been used, for example, to calculate the shape of gravitational waves emitted by two merging black hole.
You can help Wikipedia by expanding it.This relativity-related article is a stub.