Discrete gravity dynamics from effective spin foams

Understand

The first computation of a spin foam dynamics that provides a test of the quantum equations of motions of gravity is presented.

• Specifically, a triangulation that includes an inner edge is treated.
• The computation leverages the recently introduced effective spin foam models, which are particularly numerically efficient.
• Previous work has raised the concern of a flatness problem in spin foam dynamics, identifying the potential for the dynamics to lead to flat geometries in the small $\hbar$ semiclassical limit.