88 citations · 405 across the 8 of their papers we have counts for
4 papers · 1 filter
Non-convex 4d polytopes in Spin Foam Models
Benjamin Bahr
In this article we consider non-convex polytopes in . The paper consist of two parts: Firstly, we extend the proof of the formula for the volume in terms of…
Volume of 4-polytopes from bivectors
Benjamin Bahr
In this article we prove a formula for the volume of 4-dimensional polytopes, in terms of their face bivectors, and the crossings within their boundary graph. This proves that the…
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…
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…