Phys. Rev. Lett. 101, 171802 (2008) [4 pages]Grand Unification and Enhanced Quantum Gravitational EffectsReceived 7 May 2008; published 20 October 2008 In grand unified theories with large numbers of fields, renormalization effects significantly modify the scale at which quantum gravity becomes strong. This in turn can modify the boundary conditions for coupling constant unification, if higher dimensional operators induced by gravity are taken into consideration. We show that the generic size of, and the uncertainty in, these effects from gravity can be larger than the two-loop corrections typically considered in renormalization group analyses of unification. In some cases, gravitational effects of modest size can render unification impossible. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.171802
DOI:
10.1103/PhysRevLett.101.171802
PACS:
12.10.Kt, 04.60.−m, 12.10.Dm
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