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arXiv 0808.3255astro-phgr-qchep-ph
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宇宙学参数的不均匀性对测量原初非高斯性的影响

Impact of Uncertainties in the Cosmological Parameters on the Measurement of Primordial non-Gaussianity

M. Liguori, A. Riotto

备注：
10 pages, 3 figures, submitted to Phys. Rev. D
发表信息：
Phys.Rev.D78:123004,2008
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摘要：

本文研究了非高斯局域模型和等边模型中宇宙学参数的不确定性对原始NG参数fNL估计的影响。结果表明，在局域情况下，传播这些误差使WMAP和Planck的fNL相对不确定度分别增加了16%和5%，而对于等边组态，修正项分别增加了14%和4%。如果我们假设局部f_NL的中心值为60阶，根据最近WMAP的5年估计，我们得到普朗克的最终修正Δf_NL = 3。虽然不是戏剧性的，这种修正是在普朗克的预期估计不确定性的水平，然后应该考虑引用的意义，最终未来的检测。在目前的f_NL的估计中，宇宙学参数被固定在它们的最佳拟合值上。我们最后注意到，如果在分析中允许参数变化，然后将其边缘化，那么宇宙学参数的不确定性对最终f_NL误差条的影响将变得完全可以忽略。

英文摘要：

We study the impact of cosmological parameters' uncertainties on estimates of the primordial NG parameter f_NL in local and equilateral models of non-Gaussianity. We show that propagating these errors increases the f_NL relative uncertainty by 16% for WMAP and 5 % for Planck in the local case, whereas for equilateral configurations the correction term are 14% and 4%, respectively. If we assume for local f_NL a central value of order 60, according to recent WMAP 5-years estimates, we obtain for Planck a final correction Δf_NL = 3. Although not dramatic, this correction is at the level of the expected estimator uncertainty for Planck, and should then be taken into account when quoting the significance of an eventual future detection. In current estimates of f_NL the cosmological parameters are held fixed at their best-fit values. We finally note that the impact of uncertainties in the cosmological parameters on the final f_NL error bar would become totally negligible if the parameters were allowed to vary in the analysis and then marginalized over.

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