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arXiv 0802.3700astro-ph
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热中微子运动对非线性宇宙物质功率谱的影响

The Effect of Thermal Neutrino Motion on the Non-linear Cosmological Matter Power Spectrum

Jacob Brandbyge, Steen Hannestad, Troels Haugboelle, Bjarne Thomsen

摘要:

我们对含有轻中微子的宇宙学模型中非线性结构的形成进行了详细的研究。中微子热速度的影响首次被包括在一个一致的方式,并发现对物质功率谱的影响是显着的。这种影响大到足以在未来的高精度调查中进行测量。此外,我们提供了一个简单而准确的解析表达式,由于大质量中微子的波动功率的抑制。最后,我们描述了一个简单而快速的方法,包括大规模N体模拟的大质量中微子的影响,这是准确的\sum m_nu < 0.15 eV的1%的水平。

英文摘要:

We have performed detailed studies of non-linear structure formation in cosmological models with light neutrinos. For the first time the effect of neutrino thermal velocities has been included in a consistent way, and the effect on the matter power spectrum is found to be significant. The effect is large enough to be measured in future, high precision surveys. Additionally, we provide a simple but accurate analytic expression for the suppression of fluctuation power due to massive neutrinos. Finally, we describe a simple and fast method for including the effect of massive neutrinos in large-scale N-body simulations which is accurate at the 1% level for \sum m_nu < 0.15 eV.

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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