LQG spinfoam models: basic ideas and motivations

          @misc{ scivideos_PIRSA:08120050,
            doi = {10.48660/08120050},
            url = {https://pirsa.org/08120050},
            author = {Engle, Jonathan},
            keywords = {Quantum Gravity},
            language = {en},
            title = {LQG spinfoam models: basic ideas and motivations},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2008},
            month = {dec},
            note = {PIRSA:08120050 see, \url{https://scivideos.org/pirsa/08120050}}
          }
          

Abstract

We give an overview of what we have called the \'LQG spinfoam models,\' that provide a spinfoam dynamics for LQG, for arbitrary values of the Barbero-Immirzi parameter in both Lorentzian and Euclidean signatures. The key motivation behind these models was to modify the Barrett-Crane model, by handling more carefully certain constraints, called simplicity constraints, which become second class in the quantum theory. As a result, the kinematics of the models exactly match those of LQG. The goal of this talk is to provide a broad picture of the significance of these models and their basic ideas.