Bayesian Limits on Primordial Isotropy Breaking

Details Bayesian Limits on Primordial Isotropy Breaking Bayesian Limits on Primordial Isotropy Breaking

2008-07-17

arxiv.org/abs/0807.2687v1

Phys.Rev.Lett.102:031301,2009

Astronomy and Astrophysics

Astrophysics

6 double-column pages, 2 figues and 2 tables. Uses REVTeX4

Scientific paper

10.1103/PhysRevLett.102.031301

It 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.

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