Cosmological constant in spinfoam cosmology

Eugenio Bianchi (1, 2) , Thomas Krajewski (1, 3, 2) , Carlo Rovelli (1, 2) , Francesca Vidotto (1, 4, 2)

1 CPT - Centre de Physique Théorique - UMR 6207
2 CPT - Centre de Physique Théorique - UMR 7332
3 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
4 Dipartimento di Fisica

We consider a simple modification of the amplitude defining the dynamics of loop quantum gravity, corresponding to the introduction of the cosmological constant, and possibly related to the SL(2,C)q extension of the theory recently considered by Fairbairn-Meusburger and Han. We show that in the context of spinfoam cosmology, this modification yields the de Sitter cosmological solution.

Domaines: Relativité Générale et Cosmologie Quantique [gr-qc]

Eugenio Bianchi, Thomas Krajewski, Carlo Rovelli, Francesca Vidotto. Cosmological constant in spinfoam cosmology. 2011. ⟨hal-00558855⟩