Magnetic Monopoles in Grand Unified and Kaluza-Klein Theories

  • Qaisar Shafi
Part of the NATO ASI Series book series (NSSB, volume 111)


The apparent reluctance of the proton to decay into e+π°1 suggests that the superheavy gauge bosons that mediate this process must be heavier than the value predicted by minimal SU(5). Some ways of curing this difficulty within the SU(5) framework have recently been discussed2,3. Alternatively, one may resort to gauge groups larger than SU(5). Indeed, it was pointed out some years ago4 that in grand unified theories (GUTs) with intermediate mass scales, the decay rate for p → e+π° (and for other processes mediated by the superheavy gauge bosons) can be considerably lower than the value(s) given by SU(5).


Gauge Group Magnetic Charge Grand Unify Theory Magnetic Monopole Eleven Dimensional Supergravity 
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  1. 1.
    According to the IMB experiment 2.3 × 1032 yr.Google Scholar
  2. 2.
    Q. Shafi, C. Wetterich, Bartol preprint BA-83-43 (1983). Also see the discsusion by C. Hill, Fermi Lab. preprint (1983).Google Scholar
  3. 3.
    P. Frampton, S.L. Glashow, Phys. Lett. 131B, 340 (1983).ADSGoogle Scholar
  4. 4.
    Q. Shafi, C. Wetterich, Phys. Lett. 85B, 52 (1979).ADSGoogle Scholar
  5. H. Georgi, D. Nanopoulous, Nucl. Phys. B159, 16 (1979).ADSCrossRefGoogle Scholar
  6. Also see R. Robinett, J.L. Rosner, Phys. Rev., D25, 3036 (1982).ADSGoogle Scholar
  7. Y. Tosa, G. Branco and R. Marshak, Phys. Rev. D28, 1731 (1983).ADSGoogle Scholar
  8. 5.
    For further details and other relevant references, see Q. Shafi and C. Wetterich, Bartol preprint BA-83-45.Google Scholar
  9. 6.
    E. Witten, Princeton preprint (1983) and references therein.Google Scholar
  10. 7.
    See the articles by R. Sorkin and M. Perry in this volume.Google Scholar

Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • Qaisar Shafi
    • 1
  1. 1.Bartol Research FoundationUniversity of DelawareNewarkUSA

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