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Its interesting to note that it has been confirmed that high energy photons from a GRB (Gamma Ray Burst) have been observed to arrive ahead of lower energy photons.
This is predicted in Smolin's theory, as momentum space is curved (ie: 'non-metric').
Mind you, they go on to explain that this can also be explained simply by the way they're emitted from the source .. ie: the explosions aren't instantaneous .. they last for several seconds, which would account for the observed delays.
More GRBs are needed in order to pin this one down ..
.. interesting …
Cheers
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