To be science a theory must bet its life on the outcome of some future observation. That is what it means to predict something new and to be falsifiable. If the observation goes against the theory's prediction then the theory is wrong. so the theories of space time and matter that are currently under development are in a kind of informal rivalry to see which can first make a falsifiable prediction. The question that one expects a theorist to answer is "What experimental result would make you give up your theory and explore something else? Einstein 1915 Gen Rel survived that kind of test in the solar eclipse of 1919. It could have gone against, and GR would be dead. It is the honor of the theorist to make a theory which predicts something new, not observed yet, and bets its life on it---so that if that thing is not observed the theory is refuted. A theory which can accept any possible outcome of any future experiment is mush---it may be suggestive but it has no predictive value since it can accomodate anything that happens. ================= OK one of the theories being developed by the Loop QG community is described in http://arxiv.org/hep-th/0512113 and http://arxiv.org/gr-qc/0604016 which has references to the extension to 4D, work in progress. The 4D version should be out in a few months, certainly by the time LHC starts. It is a theory of space time and matter using the spinfoam formalism---let's call it SPINFOAM 4D UNIFICATION THEORY. Freidel is one of several spinfoam theorists developing it. What could LHC show that would make Freidel give up on this approach of 4D spinfoam unification? If there is something like that, then Freidel's theory makes a falsifiable prediction that it will NOT be seen. Making a falsifiable prediction scores points for the theory. Well, what about little Black Holes? They would be evidence of extra dimension, because in plain 4D there is not enough energy in LHC to produce black holes. any reaction? I have to go, back later.