Grand unification and enhanced quantum gravitational effects

Details Grand unification and enhanced quantum gravitational effects Grand unification and enhanced quantum gravitational effects

2008-05-01

arxiv.org/abs/0805.0145v2

Phys.Rev.Lett.101:171802,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure, revtex; minor changes in v2 (version published in Phys. Rev. Lett.)

Scientific paper

10.1103/PhysRevLett.101.171802

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 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.

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