Unification scale, proton decay, and manifolds of G2 holonomy

Tamar Friedmann, Edward Witten

Research output: Contribution to journalArticlepeer-review

72 Scopus citations


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 compared to other modes such as or Because of numerical uncertainties, we do not know whether to intepret this as an enhancement of the mode or a suppression of the others.

Original languageEnglish (US)
Pages (from-to)577-617
Number of pages41
JournalAdvances in Theoretical and Mathematical Physics
Issue number4
StatePublished - Jul 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Mathematics
  • General Physics and Astronomy


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