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Originally Posted by Nereid
The highest gammas that I can recall being reported are ~20 TeV, from an innovative CR 'telescope' (whose name escapes me just now), which uses water instead of air.
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Good point, that's ten million times lower than even 10^20 eV, so farther still from the Planck limit. But even more puzzling-- now they are talking about probing the Planck limit with photons that whose energies are 15 orders of magnitude smaller than where the real action is. Hardly an ideal way to test a theory!
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the source is a physical regime so far from anything probed so far in any Earthly lab (and likely to remain unprobed for possibly centuries to come) that constraining 'source effects' will likely be a headache for many decades yet.
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Yes, observational interpretation will probably always be the main stumbling block, except for those already predisposed to favor some particular quantum gravity theory (who will cite this result ad nauseum, no doubt!).