3 papers
gr-qc2018
Renormalization of symmetry restricted spin foam models with curvature in the asymptotic regime
Benjamin Bahr, Giovanni Rabuffo, Sebastian Steinhaus
We study the renormalization group flow of the Euclidean Engle-Pereira-Rovelli-Livine and Freidel-Krasnov (EPRL-FK) spin foam model in the large--limit. The vertex amplitude is…
gr-qc2018
Deformation of the EPRL spin foam model by a cosmological constant
Benjamin Bahr, Giovanni Rabuffo
In this article, we consider an ad-hoc deformation of the EPRL model for quantum gravity by a cosmological constant term. This sort of deformation has been first introduced by Han…
gr-qc2017
Towards a Cosmological subsector of Spin Foam Quantum Gravity
Benjamin Bahr, Sebastian Kloser, Giovanni Rabuffo
We examine the four dimensional path integral for Euclidean quantum gravity in the context of the EPRL-FK spin foam model. The state sum is restricted to certain symmetric configur…