Emergence of gravity from spinfoams
Institute for Gravitation and the Cosmos, Physics Department, Penn State - University Park, PA 16802-6300, USA
Accepted: 20 June 2011
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.
PACS: 04.60.Pp – Loop quantum gravity, quantum geometry, spin foams / 04.60.Gw – Covariant and sum-over-histories quantization / 04.60.Nc – Lattice and discrete methods
© EPLA, 2011