Natural TeV-Scale Gravity and coupling constant unification , in Heterotic M-Theory , with the usual hidden and visible sectors swapped


I consider a class of Grand Unified models, in which E8 is broken to SU(3)× SU(2)× SU(2)× SU(2)×U(1)Y , then to SU(3)× SU(2)diag ×U(1)Y . The breaking of (SU(2)) to SU(2)diag reduces the SU(2) coupling constant, at unification, by a factor of 1/ √ 3, so that the ratio of the SU(3) and SU(2)diag coupling constants, at unification, is equal to the ratio… (More)

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