Amplituhedron

Meronym: twistor

In another parallel universe the amplituhedron, a recent invention in quantum field theory, is a geometric form endowed with a positive Grassmannian, that is an internal arithmetical structure for the calculation of amplitudes in terms of k-planes filling up an n-dimensional space.

The amplituhedron is not built out of spacetime and probabilities; these properties merely arise as consequences of the jewel's geometry.

Scattering amplitudes that obey the laws of locality and unitarity do emerge from amplituhedra. But unlike in Feynman diagrams, the amplituhedron does not start with space-time that has these properties.