Constraint of broken charge-conjugation invariance on the baryon asymmetry in grand unified theories
The correct prediction for the baryon asymmetry is an important constraint on grand unified models. We examine a large class of models in which a group charge-conjugation operator C can be defined. The existence of this operator C tends to suppress the possible baryon asymmetry by a factor of V/sup 2//m/sub X//sup ts2/, where V is related to the scale of C-invariance breaking and m/sub X/ is the mass of the particles whose decays generate the baryon asymmetry. (These constraints do not apply to the standard SU(N) grand unified models because they do not possess a group charge-conjugation operator.) By making a few simplifying assumptions, we show that models where the C operator exists fall into two classes. In one class of models, C-invariance breaking leads to a mild suppression of the baryon asymmetry and consistency with present-day observations is easily obtained. In a second class of models, the baryon asymmetry is suppressed by m/sub N//sup ts2//m/sub X//sup ts2/, where N is a superheavy Majorana neutrino. In such models, the observed baryon asymmetry requires that m/sub N/> or approx. =10/sup 10/ GeV; implications for the masses of the ordinary light neutrinos are considered.
- Research Organization:
- Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104
- OSTI ID:
- 5650387
- Journal Information:
- Phys. Rev. D; (United States), Vol. 25:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARYONS
ASYMMETRY
UNIFIED GAUGE MODELS
C INVARIANCE
NEUTRONS
SU GROUPS
SYMMETRY BREAKING
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INVARIANCE PRINCIPLES
LIE GROUPS
MATHEMATICAL MODELS
NUCLEONS
PARTICLE MODELS
SYMMETRY GROUPS
645301* - High Energy Physics- Particle Invariance Principles & Symmetries- General- (-1987)