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arXiv 1402.0607hep-phastro-ph.CO
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动能和标量张量宇宙学对无菌中微子的影响

Effects of kination and scalar-tensor cosmologies on sterile neutrinos

Thomas Rehagen, Graciela B. Gelmini

摘要:

我们研究了大爆炸核合成前的动能和标量张量宇宙学对无菌中微子非共振产生的影响。我们表明,如果不育中微子的产生率的峰值发生在非标准宇宙学阶段,不育中微子的遗迹数密度可以减少相对于预期的数量在标准宇宙学。因此,目前由惰性中微子残余能量密度导出的活性-惰性中微子混合的界限可以大大放宽。特别是,我们表明,不育中微子,可以解释在短基线中微子实验中发现的异常是兼容的最近联合普朗克上限的贡献,宇宙的能量密度在标量张量或低再加热温度前大爆炸核合成宇宙学。

英文摘要:

We study the effects of kination and scalar-tensor pre-Big Bang Nucleosynthesis cosmologies on the non-resonant production of sterile neutrinos. We show that if the peak of the production rate of sterile neutrinos occurs during the non-standard cosmological phase, the relic number density of sterile neutrinos could be reduced with respect to the number expected in the standard cosmology. Consequently, current bounds on active-sterile neutrino mixing derived from the relic energy density of sterile neutrinos could be greatly relaxed. In particular, we show that the sterile neutrinos which could explain the anomalies found in short-baseline neutrino experiments are compatible with recent joint Planck upper limits on their contribution to the energy density of the Universe in a scalar-tensor or a low-reheating temperature pre-Big Bang Nucleosynthesis cosmology.

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