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arXiv 0907.1917astro-ph.COhep-exhep-ph
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用宇宙学方法确定中微子质量等级

Determining the Neutrino Mass Hierarchy with Cosmology

Francesco De Bernardis, Thomas D. Kitching, Alan Heavens, Alessandro Melchiorri

摘要:

结合当前的大尺度结构和宇宙微波背景(CMB)各向异性数据,可以对中微子质量之和施加强约束。在这里,我们表明,未来的宇宙剪切实验,结合CMB的约束,可以提供所需的统计精度来回答有关个别中微子物种的质量差异的问题。允许的可能性,群众是非退化的,我们结合Fisher矩阵预测弱透镜调查,如欧几里得与即将到来的普朗克实验。假设中微子质量分裂是由一个正常的层次,我们发现,组合普朗克和欧几里得可能会达到足够的灵敏度,把一个单一的物种的质量约束。使用贝叶斯证据计算,我们发现,这种未来的实验可以提供强有力的证据,无论是正常的或倒置的中微子层次。最后,我们表明,如果假设一个特定的中微子层次,那么这可能会偏向宇宙学参数的约束,例如暗能量状态方程参数,由> 1σ,和2.3σ的质量之和。

英文摘要:

The combination of current large scale structure and cosmic microwave background (CMB) anisotropies data can place strong constraints on the sum of the neutrino masses. Here we show that future cosmic shear experiments, in combination with CMB constraints, can provide the statistical accuracy required to answer questions about differences in the mass of individual neutrino species. Allowing for the possibility that masses are non-degenerate we combine Fisher matrix forecasts for a weak lensing survey like Euclid with those for the forthcoming Planck experiment. Under the assumption that neutrino mass splitting is described by a normal hierarchy we find that the combination Planck and Euclid will possibly reach enough sensitivity to put a constraint on the mass of a single species. Using a Bayesian evidence calculation we find that such future experiments could provide strong evidence for either a normal or an inverted neutrino hierachy. Finally we show that if a particular neutrino hierachy is assumed then this could bias cosmological parameter constraints, for example the dark energy equation of state parameter, by > 1σ, and the sum of masses by 2.3σ.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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