A search for sterile neutrinos with the latest cosmological observations

被引：48
作者：
Feng, Lu [1 ]
Zhang, Jing-Fei [1 ]
Zhang, Xin [1 ,2 ]
机构：
[1] Northeastern Univ, Coll Sci, Dept Phys, Shenyang 110004, Peoples R China
[2] Peking Univ, Ctr High Energy Phys, Beijing 100080, Peoples R China
来源：
EUROPEAN PHYSICAL JOURNAL C | 2017年 / 77卷 / 06期
基金：
中国国家自然科学基金;
关键词：
BARYON ACOUSTIC-OSCILLATIONS; DARK ENERGY; MASSIVE NEUTRINOS; LOCAL VALUE; PLANCK; CONSTRAINTS; CONSTANT; UNIVERSE; MATTER; PROBES;
D O I：
10.1140/epjc/s10052-017-4986-3
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We report the result of a search for sterile neutrinos with the latest cosmological observations. Both cases of massless and massive sterile neutrinos are considered in the Lambda CDM cosmology. The cosmological observations used in this work include the Planck 2015 temperature and polarization data, the baryon acoustic oscillation data, the Hubble constant direct measurement data, the Planck Sunyaev-Zeldovich cluster counts data, the Planck lensing data, and the cosmic shear data. We find that the current observational data give a hint of the existence of massless sterile neutrino (as dark radiation) at the 1.44s level, and the consideration of an extra massless sterile neutrino can indeed relieve the tension between observations and improve the cosmological fit. For the case of massive sterile neutrino, the observations give a rather tight upper limit on the mass, which implies that actually a massless sterile neutrino is more favored. Our result is consistent with the recent result of neutrino oscillation experiment done by the Daya Bay and MINOS collaborations, as well as the recent result of cosmic ray experiment done by the IceCube collaboration.
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页数：9
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