First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
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DOI：
10.1086/377226
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发表时间：
2003-02
期刊：
影响因子：
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通讯作者：
D. Spergel;L. Verde;H. Peiris;E. Komatsu;M. Nolta;C. Bennett;M. Halpern;G. Hinshaw;N. Jarosik-N.-Jar
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作者：
D. Spergel;L. Verde;H. Peiris;E. Komatsu;M. Nolta;C. Bennett;M. Halpern;G. Hinshaw;N. Jarosik-N.-Jar
WMAP 精确数据能够准确测试宇宙学模型。我们发现新兴的宇宙学标准模型（由几乎尺度不变的绝热高斯涨落孕育的扁平 Λ 主导的宇宙）适合 WMAP 数据。仅对于 WMAP 数据，最佳拟合参数为 h = 0.72 ± 0.05、Ωbh2 = 0.024 ± 0.001、Ωmh2 = 0.14 ± 0.02、τ = 0.166、ns = 0.99 ± 0.04 和 σ8 = 0.9 ± 0.1。通过仅由 WMAP 数据固定的参数，我们可以拟合更精细尺度的宇宙微波背景 (CMB) 测量和大尺度结构的测量（星系巡天和 Lyα 森林）。这个简单的模型也与许多其他天文测量结果一致：其推断的宇宙年龄与恒星年龄一致，重子/光子比与[D/H]比的测量结果一致，推断的哈勃常数与膨胀率的局部观测结果一致。然后，我们将模型参数与 WMAP 数据与其他更精细尺度的 CMB 实验（ACBAR 和 CBI）、2dFGRS 测量和 Lyα 森林数据的组合进行拟合，以找到模型的最佳拟合宇宙学参数：h = 0.71，Ωbh2 = 0.0224 ± 0.0009，Ωmh2 = 0.135，τ = 0.17 ± 0.06， 纳秒（0.05 Mpc-1）= 0.93 ± 0.03，σ8 = 0.84 ± 0.04。 WMAP 的最佳确定 τ = 0.17 ± 0.04 直接来自温度极化 (TE) 数据，而不是来自该模型拟合，但它们是一致的。这些参数意味着宇宙的年龄为 13.7 ± 0.2 Gyr。对于 Lyα 森林数据，该模型支持但不需要缓慢变化的光谱指数。该运行指标的显着性对 Lyα 森林中的不确定性敏感。通过将 WMAP 数据与其他天文数据相结合，我们约束了宇宙的几何形状 Ωtot = 1.02 ± 0.02，以及暗能量的状态方程 w < -0.78（假设 w ≥ -1，95% 置信限）。 WMAP 和 2dFGRS 数据的组合限制了稳定中微子的能量密度：Ωνh2 < 0.0072（95% 置信限）。对于三种简并中微子物种，此限制意味着它们的质量小于 0.23 eV（95% 置信限）。早期再电离的 WMAP 检测排除了暖暗物质。
WMAP precision data enable accurate testing of cosmological models. We find that the emerging standard model of cosmology, a flat Λ-dominated universe seeded by a nearly scale-invariant adiabatic Gaussian fluctuations, fits the WMAP data. For the WMAP data only, the best-fit parameters are h = 0.72 ± 0.05, Ωbh2 = 0.024 ± 0.001, Ωmh2 = 0.14 ± 0.02, τ = 0.166, ns = 0.99 ± 0.04, and σ8 = 0.9 ± 0.1. With parameters fixed only by WMAP data, we can fit finer scale cosmic microwave background (CMB) measurements and measurements of large-scale structure (galaxy surveys and the Lyα forest). This simple model is also consistent with a host of other astronomical measurements: its inferred age of the universe is consistent with stellar ages, the baryon/photon ratio is consistent with measurements of the [D/H] ratio, and the inferred Hubble constant is consistent with local observations of the expansion rate. We then fit the model parameters to a combination of WMAP data with other finer scale CMB experiments (ACBAR and CBI), 2dFGRS measurements, and Lyα forest data to find the model's best-fit cosmological parameters: h = 0.71, Ωbh2 = 0.0224 ± 0.0009, Ωmh2 = 0.135, τ = 0.17 ± 0.06, ns(0.05 Mpc-1) = 0.93 ± 0.03, and σ8 = 0.84 ± 0.04. WMAP's best determination of τ = 0.17 ± 0.04 arises directly from the temperature-polarization (TE) data and not from this model fit, but they are consistent. These parameters imply that the age of the universe is 13.7 ± 0.2 Gyr. With the Lyα forest data, the model favors but does not require a slowly varying spectral index. The significance of this running index is sensitive to the uncertainties in the Lyα forest. By combining WMAP data with other astronomical data, we constrain the geometry of the universe, Ωtot = 1.02 ± 0.02, and the equation of state of the dark energy, w < -0.78 (95% confidence limit assuming w ≥ -1). The combination of WMAP and 2dFGRS data constrains the energy density in stable neutrinos: Ωνh2 < 0.0072 (95% confidence limit). For three degenerate neutrino species, this limit implies that their mass is less than 0.23 eV (95% confidence limit). The WMAP detection of early reionization rules out warm dark matter.