Current browse context:
astro-ph.CO
Change to browse by:
References & Citations
Astrophysics > Cosmology and Nongalactic Astrophysics
Title: CMB low multipole alignments in the $\mathbfΛ$CDM and Dipolar models
(Submitted on 5 Mar 2015)
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.
Submission history
From: Alessandro Gruppuso [view email][v1] Thu, 5 Mar 2015 11:41:50 GMT (1854kb,D)