In a previous life, I used to be a particle physicist & cosmologist.
My work focused on Dark Matter and alternative models of our cosmological history.
This illustration shows two merging black holes generating gravitational waves. At large distances from the black hole merger, spacetime may be described by superpositions of two grid sets, depicting the two metrics in the bigravity framework. Credit: Illustration by me, based on an image by R. Hurt at Caltech-JPL.