期刊
EUROPEAN PHYSICAL JOURNAL C
卷 77, 期 9, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-017-5147-4
关键词
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资金
- MEC (EC) Grants [SEV-2014-0398, FPA2014-54459]
- FEDER (EC) Grants [SEV-2014-0398, FPA2014-54459]
- Generalitat Valenciana [PROMETEOII/2013/017]
- European Union's Horizon research and innovation programme under the Marie Sklodowska-Curie Grant Elusives ITN agreement [674896]
- European Union's Horizon research and innovation programme under InvisiblesPlus RISE [690575]
- U.S. National Science Foundation [NSF-PHY-1417317]
- University of Valencia
- Research Base Construction Fund Support Program - Chonbuk National University
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2017R1D1A1B06035959]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1417317] Funding Source: National Science Foundation
- National Research Foundation of Korea [2017R1D1A1B06035959] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 the 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 the conventional expectation, but they are not uniquely determined unless at least the asymmetry of the heaviest neutrino is well constrained. The cosmological constraint on L-i for a specific case is presented as an illustration.
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