Toward classical geometrodynamics from the group field theory hydrodynamics

We take the first steps toward identifying the hydrodynamics of group field theories (GFTs) and relating this hydrodynamic regime to the classical geometrodynamics of continuum space. We apply to GFT mean field theory techniques borrowed from the theory of Bose condensates, alongside standard GFT and spin foam techniques. The mean field configuration we study is, in turn, obtained from loop quantum gravity coherent states. We work in the context of two-dimensional (2D) and 3D GFT models, in Euclidean signature, both ordinary and colored, as examples of a procedure that has a more general validity. We also extract the effective dynamics of the system around the mean field configurations, and discuss the role of GFT symmetries in going from microscopic to effective dynamics. In the process, we obtain additional insights into the GFT formalism itself.