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arXiv 0801.0607astro-ph
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大质量中微子对非线性物质功率谱的影响

Impact of massive neutrinos on nonlinear matter power spectrum

Shun Saito, Masahiro Takada, Atsushi Taruya

摘要:

首次尝试用解析方法研究了基于宇宙学扰动理论的混合暗物质(冷暗物质+总质量约0.1eV的中微子)模型的非线性物质功率谱.由于大量中微子的功率谱振幅的抑制,相比的线性政权,增强在弱非线性政权的标准线性理论不再是准确的。我们证明,由于这种增强的效果和增益的波数范围内的PT预测是适用的,使用这样一个非线性模型可以使精度σ(mnu,tot)~ 0.07eV的约束总中微子质量的计划星系红移调查,一个因素的2改善相比,线性制度。

英文摘要:

We present the first attempt to analytically study the nonlinear matter power spectrum for a mixed dark matter (cold dark matter plus neutrinos of total mass ~0.1eV) model based on cosmological perturbation theory. The suppression in the power spectrum amplitudes due to massive neutrinos is, compared to the linear regime, enhanced in the weakly nonlinear regime where standard linear theory ceases to be accurate. We demonstrate that, thanks to this enhanced effect and the gain in the range of wavenumbers to which the PT prediction is applicable, the use of such a nonlinear model may enable a precision of sigma(m_nu,tot) ~ 0.07eV in constraining the total neutrino mass for the planned galaxy redshift survey, a factor of 2 improvement compared to the linear regime.

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