Discreteness corrections and higher spatial derivatives in effective   canonical quantum gravity
  Canonical quantum theories with discrete space may imply interesting effects. This article presents a general effective description, paying due attention to the role of higher spatial derivatives in a local expansion and differences to higher time derivatives. In a concrete set of models, it is shown that spatial derivatives one order higher than the classical one are strongly restricted in spherically symmetric effective loop quantum gravity. Moreover, radial holonomy corrections cannot be anomaly-free to this order. 
Martin Bojowald, George M. Paily, Juan D. Reyes
gr-qc