Bayesian Limits on Primordial Isotropy Breaking

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dc.creatorArmendariz-Picon, C.
dc.creatorPekowsky, Larne
dc.date2008-07-17
dc.date.accessioned2026-07-07T12:44:42Z
dc.date.available2026-07-07T12:44:42Z
dc.descriptionIt is often assumed that primordial perturbations are statistically isotropic, which implies, among other properties, that their power spectrum is invariant under rotations. In this article, we test this assumption by placing model-independent bounds on deviations from rotational invariance of the primordial spectrum. Using five-year WMAP cosmic microwave anisotropy maps, we set limits on the overall norm and the amplitude of individual components of the primordial spectrum quadrupole. We find that there is no significant evidence for primordial isotropy breaking, and that an eventually non-vanishing quadrupole has to be subdominant.
dc.description6 double-column pages, 2 figues and 2 tables. Uses REVTeX4
dc.identifierhttps://arxiv.org/abs/0807.2687
dc.identifierhttp://arxiv.org/abs/0807.2687
dc.identifierPhys.Rev.Lett.102:031301,2009
dc.identifierdoi:10.1103/PhysRevLett.102.031301
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/220859
dc.subjectAstrophysics
dc.titleBayesian Limits on Primordial Isotropy Breaking
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