%0 Journal Article
%A Dittrich, Bianca
%A Martín Benito, Mercedes
%A Schnetter, Erik
%T Coarse graining of spin net models: dynamics of intertwiners
%D 2013
%U https://hdl.handle.net/20.500.14352/98920
%X Spin foams are models of quantum gravity and therefore quantum space time. A key open issue is to determine the possible continuum phases of these models. Progress on this issue has been prohibited by the complexity of the full four-dimensional models. We consider here simplified analogue models, so called spin nets, that retain the main dynamical ingredient of spin foams, the simplicity constraints. For a certain class of these spin net models we determine the phase diagram and therefore the continuum phases via a coarse graining procedure based on tensor network renormalization. This procedure will also reveal an unexpected fixed point, which turns out to define a new triangulation invariant vertex model. © IOP Publishing and Deutsche Physikalische Gesellschaft.
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