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Naturally Large Cosmological Neutrino Asymmetries in the Minimal Supersymmetric Standard Model

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<mark>Journal publication date</mark>22/05/2000
<mark>Journal</mark>Physical Review Letters
Issue number21
Number of pages4
Pages (from-to)4798-4801
<mark>Original language</mark>English


A large neutrino asymmetry could have significant observable consequences for nucleosynthesis and the cosmic microwave background. If the baryon asymmetry originates via the Affleck-Dine mechanism along a d = 4 flat direction of the scalar potential in the minimal supersymmetric standard model 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 nL/nB is naturally in the range 108–109. As a result, a potentially observable neutrino asymmetry is correlated with a baryon asymmetry of the order of 10-10.