Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-08-09
Phys.Rev.Lett. 84 (2000) 4798-4801
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages LaTeX. Final version to be published in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.84.4798
A large neutrino asymmetry is an interesting possibility for cosmology, which can have significant observable consequences for nucleosynthesis and the cosmic microwave background. However, although it is a possibility, there is no obvious reason to expect the neutrino asymmetry to be observably large. Here we note that if the baryon asymmetry originates via the Affleck-Dine mechanism along a d=4 flat direction of the MSSM scalar potential and if the lepton asymmetry originates via Affleck-Dine leptogenesis along a d=6 direction, corresponding to the lowest dimension directions conserving R-parity, then the ratio n_{L}/n_{B} is naturally in the range 10^{8}-10^{9}. As a result, a potentially observable neutrino asymmetry is correlated with a baryon asymmetry of the order of 10^{-10}.
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