Cosmological consequences of grand unification beyond SU(5)

Details Cosmological consequences of grand unification beyond SU(5) Cosmological consequences of grand unification beyond SU(5)

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981nuphb.192..523b&link_type=abstract

Nuclear Physics B, Volume 192, Issue 2, p. 523-551.

Physics

Nuclear Physics

1

Scientific paper

We examine the cosmological consequences of new types of fermions generally present in GUTs based on unitary groups larger than SU(5) which break down to SU(5) at ultralarge energies. We find that some SU(5) singlet fermions in such theories tend to have masses small compared to 1015 GeV. If sufficiently light (or massless) such particles affect He abundance unacceptably. If heavier (but still light compared to 1015 GeV) the decays of such particles generate entropy and thus greatly suppress nB/nγ.
Such theories also contain ultraheavy fermions. Their decays are shown to be a prime source of singlet fermions. It is also shown that the decays of ultraheavy fermions generate entropy which tends to suppress the contribution to nB/nγ from usual mechanisms. These decays may themselves, however, generate a baryon asymmetry.
Present address: Department of Physics, University of Washington, Seattle, Washington 98195.

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