Grand unification and enhanced quantum gravitational effects

Calmet, Xavier, Hsu, Stephen D H and Reeb, David (2008) Grand unification and enhanced quantum gravitational effects. Physical Review Letters, 101 (171802). ISSN 0031-9007

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Abstract

We systematically study the unification of gauge couplings in the presence of (one or more) effective dimension-5 operators cHGµ¿Gµ¿/4Mpl, induced into the grand unified theory by gravitational interactions at the Planck scale. These operators alter the usual condition for gauge-coupling unification, which can, depending on the Higgs content H and vacuum expectation value, result in unification at scales MX significantly different than naively expected. We find nonsupersymmetric models of SU(5) and SO(10) unification, with natural Wilson coefficients c, that easily satisfy the constraints from proton decay. Furthermore, gauge-coupling unification at scales as high as the Planck scale seems feasible, possibly hinting at simultaneous unification of gauge and gravitational interactions. In the Appendix we work out the group theoretical aspects of this scenario for SU(5) and SO(10) unified groups in detail; this material is also relevant in the analysis of nonuniversal gaugino masses obtained from supergravity.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Xavier Calmet
Date Deposited: 06 Feb 2012 21:05
Last Modified: 14 Mar 2017 00:25
URI: http://sro.sussex.ac.uk/id/eprint/29437

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