Rogues' gallery: the full freedom of the Bianchi CMB anomalies
arXiv:0901.2122 · doi:10.1103/PhysRevD.79.103518
Abstract
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.
Somewhat expanded version (7 pages, 3 figures) accepted for publication in PRD. No change in results. Movie at http://www.ast.cam.ac.uk/~app26/
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- Origin & evolution of the Universe
- CMB line-of-sight integrators for nearly-isotropic cosmological models