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• W3098756361 abstract "We present an efficient numerical code and conduct, for the first time, a null and model-independent CMB test of statistical isotropy using Multipole Vectors (MVs) at all scales. Because MVs are insensitive to the angular power spectrum $C_ell$, our results are independent from the assumed cosmological model. We avoid a posteriori choices and use pre-defined ranges of scales $ellin[2,30]$, $ellin[2,600]$ and $ellin[2,1500]$ in our analyses. We find that all four masked Planck maps, from both 2015 and 2018 releases, are in agreement with statistical isotropy for $ellin[2,30]$, $ellin[2,600]$. For $ellin[2,1500]$ we detect anisotropies but this is indicative of simply the anisotropy in the noise: there is no anisotropy for $ell < 1300$ and an increasing level of anisotropy at higher multipoles. Our findings of no large-scale anisotropies seem to be a consequence of avoiding emph{a posteriori} statistics. We also find that the degree of anisotropy in the full sky (i.e. unmasked) maps vary enormously (between less than 5 and over 1000 standard deviations) among the different mapmaking procedures and data releases." @default.
• W3098756361 created "2020-11-23" @default.
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• W3098756361 date "2020-12-01" @default.
• W3098756361 modified "2023-09-26" @default.
• W3098756361 title "CMB statistical isotropy confirmation at all scales using multipole vectors" @default.
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• W3098756361 doi "https://doi.org/10.1016/j.dark.2020.100608" @default.
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