Gravity is ignored in the SM. The proton rest mass is ~0.938 GeV/c2. LHC protons will move with 7 TeV energy, presumably with a relativistic mass about 7,450 times rest mass. A cosmic ray with the highest energy was detected at about 6×1021 eV. If it was a proton, its relativistic mass would have been about 6.4×1012 times rest mass. My question is, at what energy levels would it be necessary to include gravity in the SM? I recognize this isn't an issue for forseeable particle accelerators, but astronomical events like supernova are capable of generating extremely high energy particles.
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