期刊
PHYSICAL REVIEW D
卷 89, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.89.025017
关键词
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资金
- JSPS
- Gary McCue Fellowship through UC Irvine
- NSF [PHY-1159224]
- Fulbright/MICINN Program
- Direct For Mathematical & Physical Scien
- Division Of Physics [1214648, 1159224] Funding Source: National Science Foundation
We show that the canonical oscillation-based (nonresonant) production of sterile neutrino dark matter is inconsistent at > 99% confidence with observations of galaxies in the Local Group. We set lower limits on the nonresonant sterile neutrino mass of 2.5 keV (equivalent to 0.7 keV thermal mass) using phase-space densities derived for dwarf satellite galaxies of the Milky Way as well as limits of 8.8 keV (equivalent to 1.8 keV thermal mass) based on subhalo counts of N-body simulations of M 31 analogs. Combined with improved upper mass limits derived from significantly deeper x-ray data of M 31 with full consideration for background variations, we show that there remains little room for nonresonant production if sterile neutrinos are to explain 100% of the dark matter abundance. Resonant and nonoscillation sterile neutrino production remain viable mechanisms for generating sufficient dark matter sterile neutrinos.
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