The convolutional double copy: a case study with a point

Understand

The double copy relates scattering amplitudes in gauge and gravity theories.

• It has also been extended to classical solutions, and a number of approaches have been developed for doing so.
• One of these involves expressing fields in a variety of (super-)gravity theories in terms of convolutions of gauge fields, including also BRST ghost degrees of freedom that map neatly to their corresponding counterparts in gravity.
• In this paper, we spell out how to use the convolutional double copy to map gauge and gravity solutions in the manifest Lorenz and de Donder gauges respectively.