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arXiv 0709.0253astro-ph
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中微子质量、暗能量和线性增长因子

Neutrino Mass, Dark Energy, and the Linear Growth Factor

Angeliki Kiakotou, Oystein Elgaroy, Ofer Lahav

摘要:

我们研究中微子质量和暗能量之间的简并性,因为它们在宇宙学观测中表现出来。与文献中的一个流行公式相矛盾的是,由大质量中微子引起的物质功率谱的抑制不仅是中微子与总质量密度之比f_nu=Omega_nu/Omega_m的函数,而且是每个密度的独立函数。我们还给出了一个拟合公式,f(z,k;f_nu,w,Omega_DE)=(1-A(k)*Omega_DE*f_nu+B(k)*f_nu^2-C(k)* f_nu^3)*Omega_m(z)^alpha,其中alpha依赖于暗能量状态方程参数w.然后,我们讨论宇宙学探测的f因子直接出现:奇特的速度,红移失真和综合萨克斯-沃尔夫效应。我们还修改了Eisenstein & Hu(1999)对大质量中微子存在下涨落功率谱的近似,并提供了一个修改后的程序(http://www.star.ucl.ac.uk/nu_matter_power.f)

英文摘要:

We study the degeneracies between neutrino mass and dark energy as they manifest themselves in cosmological observations. In contradiction to a popular formula in the literature, the suppression of the matter power spectrum caused by massive neutrinos is not just a function of the ratio of neutrino to total mass densities f_nu=Omega_nu/Omega_m, but also each of the densities independently. We also present a fitting formula for the logarithmic growth factor of perturbations in a flat universe, f(z, k;f_nu,w,Omega_DE)= (1-A(k)*Omega_DE*f_nu+B(k)*f_nu^2-C(k)*f_nu^3)*Omega_m(z)^alpha, where alpha depends on the dark energy equation of state parameter w. We then discuss cosmological probes where the f factor directly appears: peculiar velocities, redshift distortion and the Intergrated Sachs-Wolfe effect. We also modify the approximation of Eisenstein & Hu (1999) for the power spectrum of fluctuations in the presence of massive neutrinos and provide a revised code (http://www.star.ucl.ac.uk/~lahav/nu_matter_power.f)

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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