Document Type
Article
Publication Date
2003
Publication Title
Advances in Theoretical and Mathematical Physics
Abstract
Models of particle physics based on manifolds of G2 holonomy are in most respects much more complicated than other string-derived models, but as we show here they do have one simplification: threshold corrections to grand unification are particularly simple. We compute these corrections, getting completely explicit results in some simple cases. We estimate the relation between Newton’s constant, the GUT scale, and the value of αGUT , and explore the implications for proton decay. In the case of proton decay, there is an interesting mechanism which (relative to four-dimensional SUSY GUT’s) enhances the gauge boson contribution to p → π 0 e + L compared to other modes such as p → π 0 e + R or p → π +νR. Because of numerical uncertainties, we do not know whether to intepret this as an enhancement of the p → π 0 e + L mode or a suppression of the others.
Volume
7
First Page
577
Last Page
617
DOI
dx.doi.org/10.4310/ATMP.2003.v7.n4.a1
Rights
Open Access Paper © by International Press of Boston
Recommended Citation
Friedmann, Tamar and Witten, Edward, "Unification Scale, Proton Decay, And Manifolds Of G2 Holonomy" (2003). Mathematics Sciences: Faculty Publications, Smith College, Northampton, MA.
https://scholarworks.smith.edu/mth_facpubs/62
Comments
Archived as published.