Cosmological Consequences of Grand Unification Beyond SU(5)

Barr, Stephen M.

doi:10.1016/0550-3213(81)90440-5

Cosmological Consequences of Grand Unification Beyond SU(5)

Stephen M. Barr
(
- Washington U., Seattle
)

Dec, 1980

29 pages

Published in:

Nucl.Phys.B 192 (1981) 523-551

Published: 1981

DOI:

10.1016/0550-3213(81)90440-5

Report number:

RLO-1388-834

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Citations per year

Abstract: (Elsevier)

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 10 15 GeV. If sufficiently light (or massless) such particles affect He abundance unacceptably. If heavier (but still light compared to 10 15 GeV) the decays of such particles generate entropy and thus greatly suppress n B / n γ .

UNIFIED FIELD THEORY
WEAK INTERACTION
ELECTROMAGNETIC INTERACTION
STRONG INTERACTION
GAUGE FIELD THEORY: SU(5)
FERMION: MASS
MASS: FERMION
BARYON: ASYMMETRY
ASTROPHYSICS
MODEL: SYMMETRY BREAKING

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