Cosmic Microwave Background large-scale directional anomalies as seen by Planck and WMAP

It has been found that large-scale anisotropies in the Cosmic Microwave Background are anomalous with respect to the predictions of the standard model of cosmology. We focused on the low multipole alignments, assuming the ΛCDM model and we confirmed that the quadrupole/octupole and the dipole/quadru...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-05, Vol.841 (1), p.12008
Main Author: Polastri, L
Format: Article
Language:English
Subjects:
Anomalies
Astronomical models
Big Bang theory
Cosmic microwave background
Cosmology
Dipoles
Expanding universe theory
Multipoles
Physics
Quadrupoles
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Summary:It has been found that large-scale anisotropies in the Cosmic Microwave Background are anomalous with respect to the predictions of the standard model of cosmology. We focused on the low multipole alignments, assuming the ΛCDM model and we confirmed that the quadrupole/octupole and the dipole/quadrupole/octupole alignments are anomalous with a significance up to 99.9%, for both WMAP and Planck data. Trying to explain the origin of this kind of anomalies we tested the dipolar model. This alternative phenomenological model explains the CMB hemispherical power asymmetry found in the WMAP and Planck data, so is possible that it can solve also other CMB directional anomalies. We show that the alignments are anomalous in the dipolar model too, roughly at the same level as in ΛCDM. We conclude that the dipolar model does not provide a better fit to the data than the ΛCDM.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/841/1/012008