期刊
CLASSICAL AND QUANTUM GRAVITY
卷 33, 期 18, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/33/18/184001
关键词
cosmic microwave background; cosmological models; CMB foregrounds
类别
资金
- DFG grant 'Models of Gravity' [RTG 1620]
- US Department of Energy [DOE-SC0009946]
- NSF [AST-0807564]
- DOE [DE-FG02-95ER40899]
- ESA Member States
- NASA
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1210974] Funding Source: National Science Foundation
Several unexpected features have been observed in the microwave sky at large angular scales, both by WMAP and by Planck. Among those features is a lack of both variance and correlation on the largest angular scales, alignment of the lowest multipole moments with one another and with the motion and geometry of the solar system, a hemispherical power asymmetry or dipolar power modulation, a preference for odd parity modes and an unexpectedly large cold spot in the Southern hemisphere. The individual p-values of the significance of these features are in the per mille to per cent level, when compared to the expectations of the best-fit inflationary ACDM model. Some pairs of those features are demonstrably uncorrelated, increasing their combined statistical significance and indicating a significant detection of CMB features at angular scales larger than a few degrees on top of the standard model. Despite numerous detailed investigations, we still lack a clear understanding of these large-scale features, which seem to imply a violation of statistical isotropy and scale invariance of inflationary perturbations. In this contribution we present a critical analysis of our current understanding and discuss several ideas of how to make further progress.
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