  We consider a search for phenomenological signatures from an hypothetical
space-time granularity that respects Lorentz invariance. The model is based on
the idea that the metric description of Einstein's gravity corresponds to a
hydrodynamic characterization of some deeper underlying structure, and that
Einstein's gravity is thus to be seen as emergent. We present the specific
phenomenological model in detail and analyze the bounds on its free parameters
established by a experiment specifically designed to test this model.
