Theory for scattering amplitudes in perturbative quantum gravity
Double copy theory is a theory in
theoretical physics, specifically in
quantum gravity, that hypothesizes a
perturbativeduality between
gauge theory and
gravity. The theory says that
scattering amplitudes in
non-Abeliangauge 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.[5][6] This was proven to work at tree level and at higher orders,[1] including at
fourth post-Minkowskian order.[7] The theory has been applied to black holes.[8]