Smoothing spline primordial power spectrum reconstruction
Smoothing spline primordial power spectrum reconstruction
复制标题
平滑样条原始功率谱重建
DOI：
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复制
发表时间：
2005
期刊：
影响因子：
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通讯作者：
R. Jimenez
中科院分区：
文献类型：
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作者：
C. Sealfon;L. Verde;R. Jimenez
我们用平滑样条重建原始功率谱（PPS）的形状。我们的自适应平滑样条技术为搜索PPS中的平滑特征（如运行谱指数）提供了一种补充方法。使用这种技术，我们发现威尔金森微波各向异性探测器第一年的数据没有明显的迹象表明PPS偏离了哈里森-泽尔多维奇光谱，也没有证据表明大尺度上的功率损失。我们还研究了额外PPS自由对宇宙学参数的影响。PPS的平滑变化与其他宇宙学参数没有明显的退化，但样条重建极大地增加了光学深度和重子分数的误差。
We reconstruct the shape of the primordial power spectrum (PPS) using a smoothing spline. Our adapted smoothing spline technique provides a complementary method to existing efforts to search for smooth features in the PPS, such as a running spectral index. With this technique we find no significant indication with Wilkinson Microwave Anisotropy Probe first-year data that the PPS deviates from a Harrison-Zeldovich spectrum and no evidence for loss of power on large scales. We also examine the effect on the cosmological parameters of the additional PPS freedom. Smooth variations in the PPS are not significantly degenerate with other cosmological parameters, but the spline reconstruction greatly increases the errors on the optical depth and baryon fraction.