Comments on intermediate-scale models

J. Ellis, K. Enqvist, D. V. Nanopoulos, K. Olive

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Some superstring-inspired models employ intermediate scales m1 of gauge symmetry breaking. Such scales should exceed 1016 GeV in order to avoid prima facie problems with baryon decay through heavy particles and non-perturbative behaviour of the gauge couplings above mI. However, the intermediate-scale phase transition does not occur until the temperature of the Universe falls below O(mw), after which an enormous excess of entropy is generated. Moreover, gauge symmetry breaking by renormalization group-improved radiative corrections is inapplicable because the symmetry-breaking field has no renormalizable interactions at scales below mI. We also comment on the danger of baryon and lepton number violation in the effective low-energy theory.

Original languageEnglish (US)
Pages (from-to)415-420
Number of pages6
JournalPhysics Letters B
Issue number4
StatePublished - Apr 23 1987

Bibliographical note

Funding Information:
The work of K.E. and D.V.N. wass upporteidn part by DOE grant DE-AC02-76ER0081a ndin part by the Universityo f WisconsinR esearchC ommittee with funds granted by the Wisconsin Alumni ResearchF oundationT.h e work of K.A.O. was sup-portedin partb y DOE grantD E-AC02-83ER-40105.


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