Model-independent Primordial Power Spectrum from MAXIMA, BOOMERANG, and DASI Data
Model-independent Primordial Power Spectrum from MAXIMA, BOOMERANG, and DASI Data
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来自 MAXIMA、BOOMERANG 和 DASI 数据的独立于模型的原始功率谱
DOI：
10.1086/340492
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
G. Mathews
中科院分区：
文献类型：
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作者：
Yun Wang;G. Mathews
对物质密度起伏的原始功率谱的独立于模型的测定可以独一无二地探索非常早期的宇宙的物理，并为膨胀模型提供强大的约束。我们将原始功率谱A(K)参数化为任意函数，并从宇宙微波背景(CMB)辐射最大值、回飞镖和DASI的辐射各向异性测量中推导出它的入库幅度。我们发现，对于A(K)=1(标度不变)的平坦宇宙，当尺度k<；0.001 h mpc-1时，原始功率谱与标度不变的哈里森-泽尔多维奇谱基本一致。然而，我们推导出，与0.001 h Mpc-1≲k≲0.01h Mpc-1的标度不变功率谱相比，功率有所上升。我们的结果与大规模结构数据一致，似乎表明目前的观测数据允许在非常早期的宇宙中存在不寻常的物理现象的可能性。
A model-independent determination of the primordial power spectrum of matter density fluctuations could uniquely probe physics of the very early universe and provide powerful constraints on inflationary models. We parameterize the primordial power spectrum A(k) as an arbitrary function and deduce its binned amplitude from the cosmic microwave background (CMB) radiation anisotropy measurements of MAXIMA, BOOMERANG, and DASI. We find that for a flat universe with A(k) = 1 (scale-invariant) for scales k < 0.001 h Mpc-1, the primordial power spectrum is marginally consistent with a scale-invariant Harrison-Zeldovich spectrum. However, we deduce a rise in power compared to a scale-invariant power spectrum for 0.001 h Mpc-1 ≲ k ≲ 0.01 h Mpc-1. Our results are consistent with large-scale structure data and seem to suggest that the current observational data allow for the possibility of unusual physics in the very early universe.