AI 中文总结
该研究用Modified Richardson--Lucy算法结合Planck、ACT、SPT-3G数据重构CMB全尺度原初功率谱，未发现其偏离幂律的显著证据，且验证了Planck与ACT观测的一致性，ACT小尺度蓝倾斜偏好仅达1σ水平。
AI 中文摘要
我们在宇宙微波背景（CMB）观测可及的全宇宙学尺度范围内重构原初功率谱（PPS）。采用Modified Richardson--Lucy算法，我们通过对Planck PR3、PR4数据，阿塔卡马宇宙学望远镜（ACT）DR6数据以及南极望远镜3G（SPT-3G）D1数据进行去卷积，实现自由形式的重构。在不同正则化方案下，我们未发现原初功率谱偏离幂律形式的显著证据。重构谱在Planck与ACT之间呈现强相关性，甚至在两者重叠的$0.07 < k < 0.14\\,\mathrm{Mpc}^{-1}$范围内的局域特征层面也一致，证明了两次观测的一致性。采用互补的参数化贝叶斯重构方法，我们发现此前讨论的ACT数据小尺度蓝倾斜偏好仅在$1\sigma$水平上显著。
英文摘要
We reconstruct the primordial power spectrum (PPS) across the full range of cosmological scales accessible to Cosmic Microwave Background (CMB) observations. Using the Modified Richardson--Lucy algorithm, we perform free-form reconstructions through deconvolution of Planck PR3 and PR4, Atacama Cosmology Telescope (ACT) DR6, and South Pole Telescope 3G (SPT-3G) D1 data. Across different regularization schemes, we find no evidence for significant deviations from a power-law primordial spectrum. The reconstructed spectra show a strong correlation between Planck and ACT, even at the level of localized features over their overlapping range, $0.07 < k < 0.14\,\mathrm{Mpc}^{-1}$, demonstrating consistency between the two observations. Using a complementary parametric Bayesian reconstruction, we find that the previously discussed preference for a blueward tilt in the ACT data at small scales is preferred only at the $1σ$ level.
Comments45 pages, 25 figures and 5 tables
