Reheating-temperature independence of cosmological baryon asymmetry in Affleck-Dine leptogenesis
نویسندگان
چکیده
In this paper we point out that the cosmological baryon asymmetry in our universe is generated almost independently of the reheating temperature TR in Affleck-Dine leptogenesis and it is determined mainly by the mass of the lightest neutrino, mν1, in a wide range of the reheating temperature TR ≃ 105–1012 GeV. The present baryon asymmetry predicts the mν1 in a narrow region, mν1 ≃ (0.3– 1) × 10−9 eV. Such a small mass of the lightest neutrino leads to a high predictability on the mass parameter mνeνe contributing to the neutrinoless double beta decay. We also propose an explicit model in which such an ultralight neutrino can be naturally obtained.
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