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Astrophysics > Cosmology and Nongalactic Astrophysics

Title: CMB low multipole alignments in the $\mathbfΛ$CDM and Dipolar models

Abstract: The dipolar model \cite{Gordon:2005ai} has attracted much interest because it may phenomenologically explain the CMB hemispherical power asymmetry found in the WMAP and Planck data. Since such a model explicitly breaks isotropy at large angular scales it is natural to wonder whether it can also explain other CMB directional anomalies. Focusing on the low $\ell$ alignments and assuming $\Lambda$CDM, we confirm that the quadrupole/octupole and the dipole/quadrupole/octupole alignments are anomalous with a significance up to $99.9\%$ C.L., for both WMAP and Planck data. Moreover, we show for the first time that such features are anomalous also in the dipolar model, roughly at the same level as in $\Lambda$CDM. We conclude that the dipolar model does not provide a better fit to the data than the $\Lambda$CDM.
Comments: 13 pages, 2 figures and 4 tables
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:1503.01611 [astro-ph.CO]
  (or arXiv:1503.01611v1 [astro-ph.CO] for this version)

Submission history

From: Alessandro Gruppuso [view email]
[v1] Thu, 5 Mar 2015 11:41:50 GMT (1854kb,D)