Spatial curvature falsifies eternal inflation
Spatial curvature falsifies eternal inflation
复制标题
空间曲率伪造了永恒的膨胀
DOI：
10.1088/1475-7516/2012/06/029
复制
发表时间：
2012
影响因子：
6.4
通讯作者：
M. Schillo
中科院分区：
文献类型：
--
作者：
M. Kleban;M. Schillo
暴胀产生大规模的宇宙密度扰动，其特征是局部平坦背景的各向同性、均匀和高斯随机分布。即使在平坦的宇宙中，在一个哈勃体积内测量到的空间曲率也会受到长波摄动的影响，通常不会为零。这些相同的扰动决定了宇宙微波背景（CMB）的温度波动，这是（10−5）。因此，微波背景温度图中的低- 1多极矩预测了测量的空间曲率Ωk的值。在此基础上，我们认为测量|Ωk| > 10−4将以高置信度排除我们过去的缓慢滚动永恒暴胀，而测量Ωk <−10−4（这是正曲率，局部封闭宇宙）也排除了假真空永恒暴胀，在相同的置信度水平。换句话说，负曲率（局部开放宇宙）与假真空永恒暴胀一致，但与慢滚永恒暴胀不一致，而正曲率证伪了两者。不久的将来，实验将极大地扩展Ωk测量的灵敏度，并对这些预测进行尖锐的检验。
Inflation creates large-scale cosmological density perturbations that are characterized by an isotropic, homogeneous, and Gaussian random distribution about a locally flat background. Even in a flat universe, the spatial curvature measured within one Hubble volume receives contributions from long wavelength perturbations, and will not in general be zero. These same perturbations determine the Cosmic Microwave Background (CMB) temperature fluctuations, which are (10−5). Consequently, the low-l multipole moments in the CMB temperature map predict the value of the measured spatial curvature Ωk. On this basis we argue that a measurement of |Ωk| > 10−4 would rule out slow-roll eternal inflation in our past with high confidence, while a measurement of Ωk < −10−4 (which is positive curvature, a locally closed universe) rules out false-vacuum eternal inflation as well, at the same confidence level. In other words, negative curvature (a locally open universe) is consistent with false-vacuum eternal inflation but not with slow-roll eternal inflation, and positive curvature falsifies both. Near-future experiments will dramatically extend the sensitivity of Ωk measurements and constitute a sharp test of these predictions.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.