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- W4309178949 abstract "The lack of power of large--angle CMB anisotropies is known to increase its statistical significance at higher Galactic latitudes, where a string--inspired pre--inflationary scale $Delta$ can also be detected. Considering the Planck 2015 data, and relying largely on a Bayesian approach, we show that the effect is mostly driven by the emph{even}--$ell$ harmonic multipoles with $ell lesssim 20$, which appear sizably suppressed in a way that is robust with respect to Galactic masking, along with the corresponding detections of $Delta$. On the other hand, the first emph{odd}--$ell$ multipoles are only suppressed at high Galactic latitudes. We investigate this behavior in different sky masks, constraining $Delta$ through even and odd multipoles, and we elaborate on possible implications. We include low--$ell$ polarization data which, despite being noise--limited, help in attaining confidence levels of about 3 $sigma$ in the detection of $Delta$. We also show by direct forecasts that a future all--sky $E$--mode cosmic--variance--limited polarization survey may push the constraining power for $Delta$ beyond 5 $sigma$." @default.
- W4309178949 created "2022-11-24" @default.
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- W4309178949 date "2017-12-08" @default.
- W4309178949 modified "2023-10-14" @default.
- W4309178949 title "The Evens and Odds of CMB Anomalies" @default.
- W4309178949 doi "https://doi.org/10.48550/arxiv.1712.03288" @default.
- W4309178949 hasPublicationYear "2017" @default.
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