Flavor versus mass eigenstates in neutrino asymmetries: implications for cosmology

Abstract

We show that, if they exist, lepton number asymmetries ($L_{\alpha }$) of neutrino flavors should be distinguished from the ones ($L_i$) of mass eigenstates, since Big Bang Nucleosynthesis (BBN) bounds on the flavor eigenstates cannot be directly applied to the mass eigenstates. Similarly, Cosmic Microwave Background (CMB) constraints on mass eigenstates do not directly constrain flavor asymmetries. Due to the difference of mass and flavor eigenstates, the cosmological constraint on the asymmetries of neutrino flavors can be much stronger than conventional expectation, but not uniquely determined unless at least the asymmetry of the heaviest neutrino is well constrained. Cosmological constraint on $L_i$ for a specific case is presented as an illustration.

7 pages, 4 figures, matching to journal version

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• Big-Bang Nucleosynthesis
• Observation of electron-antineutrino disappearance at Daya Bay
• A 2.4% Determination of the Local Value of the Hubble Constant
• Cosmological lepton asymmetry with a nonzero mixing angle θ_{13}
• Does the CMB prefer a leptonic Universe?

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