CMB low multipole alignments across WMAP and \emph{Planck} data releases
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arXiv
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2024
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| author | Patel, Sanjeet Kumar Aluri, Pavan Kumar Ralston, John P. |
| author_facet | Patel, Sanjeet Kumar Aluri, Pavan Kumar Ralston, John P. |
| contents | The first observations of the cosmic microwave background (CMB) from NASA's \emph{Wilkinson Microwave Anisotropy Probe} (WMAP) led to finding `alignment' anomalies not expected from fluctuations in the isotropic cosmological model. We study the data of all 8 full-sky public releases since then to test for anomalous alignments and shapes of the first 60 multipoles, i.e., over the range $2\leq l \leq 61$. We use rotationally invariant and covariant statistics to test isotropy of all subsequent WMAP data releases, along with those from the ESA's \emph{Planck} mission. Anomalous alignments among the multipoles $l=1, 2, 3$ are very consistent and robust. More alignments are detected, some of them new, while significance is diluted by the large range of the search. Power entropy, a measure of the randomness of the multipoles, is consistently anomalous at about $2σ$ level or better across all data releases. It appears that the CMB is not as random as the cosmological principle predicts on large angular scales |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_03024 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | CMB low multipole alignments across WMAP and \emph{Planck} data releases Patel, Sanjeet Kumar Aluri, Pavan Kumar Ralston, John P. Cosmology and Nongalactic Astrophysics The first observations of the cosmic microwave background (CMB) from NASA's \emph{Wilkinson Microwave Anisotropy Probe} (WMAP) led to finding `alignment' anomalies not expected from fluctuations in the isotropic cosmological model. We study the data of all 8 full-sky public releases since then to test for anomalous alignments and shapes of the first 60 multipoles, i.e., over the range $2\leq l \leq 61$. We use rotationally invariant and covariant statistics to test isotropy of all subsequent WMAP data releases, along with those from the ESA's \emph{Planck} mission. Anomalous alignments among the multipoles $l=1, 2, 3$ are very consistent and robust. More alignments are detected, some of them new, while significance is diluted by the large range of the search. Power entropy, a measure of the randomness of the multipoles, is consistently anomalous at about $2σ$ level or better across all data releases. It appears that the CMB is not as random as the cosmological principle predicts on large angular scales |
| title | CMB low multipole alignments across WMAP and \emph{Planck} data releases |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2405.03024 |