We compare three independent, cosmological linear perturbation theory codes to assess the level of agreement between them and to improve upon it by investigating the sources of discrepancy. By eliminating the major sources of numerical instability the final level of agreement between the codes was improved by an order of magnitude. The relative error is now below 10(-3) for the dark matter power spectrum. For the cosmic microwave background anisotropies and using identical ionization histories the agreement is below the sampling variance up to l=3000, with close to 10(-3) accuracy reached over most of this range of scales. The same level of agreement is also achieved for the polarization spectrum and the temperature-polarization cross-spectrum. Linear perturbation theory codes are thus well prepared for the present and upcoming high precision cosmological observations. The remaining systematic errors are likely to be dominated by the uncertainties in the recombination history.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据