Emergence of gravity from spinfoams

Understand

We find a nontrivial regime of spinfoam quantum gravity that reproduces classical Einstein equations.

• This is the double scaling limit of small Immirzi parameter (gamma), large spins (j) with physical area (gamma times j) constant.
• In addition to quantum corrections in the Planck constant, we find new corrections in the Immirzi parameter due to the quantum discreteness of spacetime.
• The result is a strong evidence that the spinfoam covariant quantization of general relativity possesses the correct classical limit.