The amplituhedron, or a similar geometric object, could help by removing two deeply rooted principles of physics: locality and unitarity.
They have also found a “master amplituhedron” with an infinite number of facets, analogous to a circle in 2-D, which has an infinite number of sides. Its volume represents, in theory, the total amplitude of all physical processes. Lower-dimensional amplituhedra, which correspond to interactions between finite numbers of particles, live on the faces of this master structure.
From Quanta Magazine