Reconstructing the primordial power spectrum
Reconstructing the primordial power spectrum
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DOI：
10.1046/j.1365-8711.2003.06807.x
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发表时间：
2003-02
期刊：
影响因子：
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通讯作者：
S. Bridle;A. Lewis;J. Weller;G. Efstathiou
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作者：
S. Bridle;A. Lewis;J. Weller;G. Efstathiou
我们利用最新的宇宙微波背景数据，包括威尔金森微波各向异性探测器（WMAP）的新结果和二度场星系红移巡天（2dFGRS）的大尺度结构数据，重建了原始功率谱的形状。我们讨论了考虑四个宇宙学参数的不确定性的两种参数化。首先，我们通过倾斜和运行谱指数参数化初始谱，只有在分析中包括前三个WMAP多极子（l = 2,3,4）时，才能找到运行谱指数的边缘证据。其次，为了进一步研究低CMB大尺度功率，我们通过引入一个没有功率的尺度来修改传统的幂律谱。我们发现k(c)的切割位置类似于3 X 10(-4) Mpc(-1)，尽管不排除k(c) = 0（没有切割）。
We reconstruct the shape of the primordial power spectrum from the latest cosmic microwave background data, including the new results from the Wilkinson Microwave Anisotropy Probe (WMAP), and large scale structure data from the two degree field galaxy redshift survey (2dFGRS). We discuss two parameterizations taking into account the uncertainties in four cosmological parameters. First we parameterize the initial spectrum by a tilt and a running spectral index, finding marginal evidence for a running spectral index only if the first three WMAP multipoles (l = 2,3,4) are included in the analysis. Secondly, to investigate further the low CMB large scale power, we modify the conventional power-law spectrum by introducing a scale above which there is no power. We find a preferred position of the cut at k(c) similar to 3 X 10(-4) Mpc(-1) although k(c) = 0 (no cut) is not ruled out.