Additional light sterile neutrinos and cosmology

被引：49
作者：
Jacques, Thomas D. [1 ,2 ]
Krauss, Lawrence M. [1 ,2 ]
Lunardini, Cecilia [2 ]
机构：
[1] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
[2] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA
来源：
PHYSICAL REVIEW D | 2013年 / 87卷 / 08期
基金：
美国国家科学基金会;
关键词：
BIG-BANG NUCLEOSYNTHESIS; UPPER LIMIT; CONSTRAINTS; OSCILLATIONS; NUMBER;
D O I：
10.1103/PhysRevD.87.083515
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Tantalizing cosmological and terrestrial evidence suggests the number of light neutrinos may be greater than 3, motivating a careful reexamination of cosmological bounds on extra light species. Big bang nucleosynthesis constrains the number of relativistic neutrino species present during nucleosynthesis, N-eff(BBN), while measurements of the cosmic microwave background (CMB) angular power spectrum constrain the effective energy density in relativistic neutrinos at the time of matter-radiation equality, N-eff(CMB). There are a number of scenarios where new sterile neutrino species may have different contributions to Delta N-eff(BBN) and Delta N-eff(CMB), for masses that may be relevant to reconciling cosmological constraints with various terrestrial claims of neutrino oscillations. We consider a scenario with two sterile neutrinos and explore whether partial thermalization of the sterile states can ease the tension between cosmological constraints on N-eff(BBN) and terrestrial data. We then investigate the effect of a nonzero neutrino mass on their contribution to the radiation abundance, finding reductions in Delta N-eff(CMB) of more than 5% for neutrinos with masses above 0.5 eV. While the effects we investigate here could play a role, we nevertheless find that two additional light sterile neutrinos species cannot fit all the data at the 95% confidence level. DOI: 10.1103/PhysRevD.87.083515
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页数：9
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