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Originally Posted by Nereid
In a nutshell, very distant point sources will be 'smeared out' by space (which is a 'spinfoam' in LQG), so determining the angular size (as we detect it) of very distant point sources should also test (or set limits on) some properties of space.
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Similarly, measuring the arrival time of 100TeV photons versus MeV photons from the short GRBs could tell us something about LQG. This might be harder to measure, since we don't yet have very directional detectors for the higher energy range photons.