Evolution of Cosmological Baryon Asymmetries
Apr, 198088 pages
Published in:
- Phys.Rev.D 22 (1980) 2953
Report number:
- EFI-80-07-CHICAGO
Citations per year
Abstract: (APS)
The time evolution of the baryon asymmetry (knBs) due to the interactions of a superheavy gauge boson (mass MX∼1015 GeV, coupling strength α∼145) is obtained by numerically integrating the Boltzmann equations. Particle interactions in the very early universe (t≲10−35 sec) are assumed to be described by the SU(5) grand unification theory. To a good approximation the results depend upon one parameter, K≡2.9×1017 α GeVMX. If C and CP are not violated in the decays of the superheavy boson no asymmetry develops, and any initial baryon asymmetry is reduced by a factor of ≅exp(−5.5K). If both C and CP are violated then an initially symmetrical universe evolves a baryon asymmetry which today corresponds to knBs≅7.8×10−3ε[1+(16K)1.3], where ε2 is the baryon excess produced when an X−X¯ pair decays. Decays and inverse decays of superheavy bosons are primarily responsible for these results (as Weinberg and Wilczek suggested); however for K≫1 baryon production falls off much less rapidly than they had expected. A gauge boson of mass 3×1014 GeV could have generated the observed asymmetry knBs≅10−9.8±1.6 if ε≅10−4.3±1.6. In a companion paper the role of Higgs bosons is considered.- ASTROPHYSICS
- BARYON: ASYMMETRY
- GAUGE FIELD THEORY: SU(5)
- INVARIANCE: CHARGE CONJUGATION
- INVARIANCE: CP
- VIOLATION: CHARGE CONJUGATION
- CP: violation
- GAUGE BOSON: SUPERHEAVY
- UNIFIED FIELD THEORY
- WEAK INTERACTION
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