Rogues' gallery: the full freedom of the Bianchi CMB anomalies

Details Rogues' gallery: the full freedom of the Bianchi CMB anomalies Rogues' gallery: the full freedom of the Bianchi CMB anomalies

2009-01-15

arxiv.org/abs/0901.2122v2

Phys.Rev.D79:103518,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Somewhat expanded version (7 pages, 3 figures) accepted for publication in PRD. No change in results. Movie at http://www.as

Scientific paper

10.1103/PhysRevD.79.103518

Combining a recent derivation of the CMB evolution equations for homogeneous but anisotropic (Bianchi) cosmologies with an account of the full linearized dynamical freedoms available in such models, I calculate and discuss the various temperature and polarisation anisotropy patterns which may be formed. Certain anisotropies can be hidden in superhorizon modes at early times, thus avoiding any constraints from nucleosynthesis while nevertheless producing non-trivial redshift-zero temperature patterns in flat and open universes. The results are likely to be more of pedagogical than observational interest, but future work will assess whether such patterns can be matched to anomalies in WMAP results.

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