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I suggest an effective model between the GUT and the electroweak scale. It only introduces the two symmetries of U(1)B−L and U(1)D besides the SM groups. The two symmetries are individually broken at the reheating temperature of the universe of 1012 GeV and the scale of 3∼4 TeV. The model can simultaneously accommodate the tiny neutrino masses, the matter–antimatter asymmetry and the cold dark matter...
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