标题： 原初功率谱的不相关估计 显示英文标题

标题： Uncorrelated estimates of the primordial power spectrum

摘要： 我们使用局部主成分分析来检测曲率扰动的原始功率谱尺度不变性的偏差。 通过该技术，我们对五个波数区间内的原始功率谱进行了不相关的估计。 在最小LCDM模型框架下，利用来自WMAP和ACT实验的最新宇宙微波背景数据，我们发现超过95%的优选模型与尺度不变性假设不兼容，但仍与幂律原始谱相容。 我们还通过在模拟数据上进行蒙特卡洛研究，预测了普朗克实验的灵敏度和可达到的约束。 普朗克可以显著提高对原始功率谱的约束，特别是在小尺度上，大约提高4倍。 显示英文摘要

摘要： We use the localized principle component analysis to detect deviations from scale invariance of the primordial power spectrum of curvature perturbations. With the technique we make uncorrelated estimates of the primordial power spectrum with five wavenumber bins. In the framework of a minimal LCDM model, using the latest cosmic microwave background data from the WMAP and ACT experiments we find that more than 95% of the preferred models are incompatible with the assumption of scale-invariance, but still compatible with a power-law primordial spectrum. We also forecast the sensitivity and constraints achievable by the Planck experiment by performing Monte Carlo studies on simulated data. Planck could significantly improve the constraints on the primordial power spectrum, especially at small scales by roughly a factor of 4.