Sterile neutrinos help reconcile the observational results of primordial gravitational waves from Planck and BICEP2
Sterile neutrinos help reconcile the observational results of primordial gravitational waves from Planck and BICEP2
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惰性中微子有助于协调普朗克和 BICEP2 对原初引力波的观测结果
DOI：
10.1016/j.physletb.2014.12.012
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发表时间：
2014-03
影响因子：
4.4
通讯作者：
Xin Zhang
中科院分区：
文献类型：
--
作者：
Jing-Fei Zhang;Yun-He Li;Xin Zhang
结果表明，在Λ CDM+ r模型中引入不育中微子可以缓解普朗克温度数据和BICEP 2 B模偏振数据之间关于张量标量比r的紧张关系.本文称之为Λ CDM+ r+ ν s模型。与Λ CDM+ r模型相比，Λ CDM+ r+ ν s模型多了两个参数：N eff和m ν，sterile eff.我们表明，在这个模型中，普朗克和BICEP 2之间的紧张关系可以大大缓解的代价增加ns。然而，与Λ CDM+ r+ d n s/d ln k模型相比，Λ CDM + r + ν s模型可以显著减少普朗克和BICEP 2之间的紧张关系，但由于产生了10− 2阶谱指数的大运行而给暴胀带来麻烦，因此对于暴胀来说，Λ CDM+ r+ ν s模型要好得多。通过在标准宇宙学中加入一个不育中微子，除了与BICEP 2的张力外，普朗克与其他天体物理数据的张力，如H 0直接测量、Sunyaev-Zeldovich星团计数和星系切变数据，都可以得到显著缓解。因此，这种模式似乎是一种经济的选择。结合普朗克温度数据、WMAP-9偏振数据和重子声振荡数据以及所有这些天体物理数据（包括BICEP 2），我们发现在Λ CDM+ r+ ν s模型中ns = 0.999±0.011，r= 0.21− 0.05+ 0.04，Neff = 3.95±0.33，m ν，sterile eff= 0.51− 0.13+ 0.12 eV.因此，我们的结果在2.7σ水平上倾向于Δ Neff> 0，在3.9σ水平上倾向于无菌中微子质量不为零。
We show that involving a sterile neutrino species in the Λ CDM+ r model can help relieve the tension about the tensor-to-scalar ratio r between the Planck temperature data and the BICEP2 B-mode polarization data. Such a model is called the Λ CDM+ r+ ν s model in this paper. Compared to the Λ CDM+ r model, there are two extra parameters, N eff and m ν, sterile eff, in the Λ CDM+ r+ ν s model. We show that in this model the tension between Planck and BICEP2 can be greatly relieved at the cost of the increase of n s. However, comparing with the Λ CDM+ r+ d n s/d ln k model that can significantly reduce the tension between Planck and BICEP2 but also makes trouble to inflation due to the large running of the spectral index of the order 10− 2 produced, the Λ CDM+ r+ ν s model is much better for inflation. By including a sterile neutrino species in the standard cosmology, besides the tension with BICEP2, the other tensions of Planck with other astrophysical data, such as the H 0 direct measurement, the Sunyaev–Zeldovich cluster counts, and the galaxy shear data, can all be significantly relieved. So, this model seems to be an economical choice. Combining the Planck temperature data, the WMAP-9 polarization data, and the baryon acoustic oscillation data with all these astrophysical data (including BICEP2), we find that in the Λ CDM+ r+ ν s model n s= 0.999±0.011, r= 0.21− 0.05+ 0.04, N eff= 3.95±0.33 and m ν, sterile eff= 0.51− 0.13+ 0.12 eV. Thus, our results prefer Δ N eff> 0 at the 2.7σ level and a nonzero mass of sterile neutrino at the 3.9σ level.
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DOI：
10.1016/j.nuclphysb.2005.09.041
发表时间：
2005-06
期刊：
Nuclear Physics
影响因子：
--
作者：
G. Mangano;G. Miele;S. Pastor;T. Pinto;O. Pisanti;P. Serpico
通讯作者：
G. Mangano;G. Miele;S. Pastor;T. Pinto;O. Pisanti;P. Serpico
特罗伊茨克实验后的短基线电子中微子振荡长度
影响因子：
5
作者：
Giunti, C.;Laveder, M.;Li, Y. F.;Long, H. W.
通讯作者：
Long, H. W.
影响因子：
8.6
作者：
R. Battye;A. Moss
通讯作者：
R. Battye;A. Moss
影响因子：
6.4
作者：
R. Flauger;R. Flauger;J. Hill;D. Spergel
通讯作者：
R. Flauger;R. Flauger;J. Hill;D. Spergel
DOI：
10.1103/physrevlett.112.051302
发表时间：
2013-07
期刊：
--
影响因子：
--
作者：
Mark Wyman;D. Rudd;R. A. Vanderveld;Wayne Hu
通讯作者：
Mark Wyman;D. Rudd;R. A. Vanderveld;Wayne Hu