Gravity is ignored in the SM. The proton rest mass is ~0.938 GeV/$c^2$. 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 $6\times 10^{21}$ eV. If it was a proton, its relativistic mass would have been about $6.4\times 10^{12}$ 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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This question is a bit open ended. There are theories and maybe some experimental hints of extra large dimensions and black hole or AdS amplitudes with heavy ion collisions. The jury is of course still out, but there might be some gravity physics creeping into the standard model + QCD in the TeV energy range and above. |
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At or near Planck energy gravity has to be taken seriously and directly. But even at much lower energy scale number of extra ordinary phenomena should take place which should be "beyond standard model". However no body knows for sure about the exact energy scale of this "beyond standard model" physics. It is likely that some "beyond S.M." physics should be observed at the LHC energy scale. |
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