Polarized Spots in Anisotropic Open Universes

Details Polarized Spots in Anisotropic Open Universes Polarized Spots in Anisotropic Open Universes

2009-05-14

arxiv.org/abs/0905.2307v2

Class.Quant.Grav.26:172001,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 1 figure, revisions to match version published in CQG

Scientific paper

10.1088/0264-9381/26/17/172001

We calculate the temperature and polarization patterns generated in anisotropic cosmological models drawn from the Bianchi classification. We show that localized features in the temperature pattern, perhaps similar to the cold spot observed in the Wilkinson Microwave Anisotropy Probe (WMAP) data, can be generated in models with negative spatial curvature, i.e. Bianchi types V and VII$_{h}$. Both these models also generate coherent polarization patterns. In Bianchi VII$_h$, however, rotation of the polarization angle as light propagates along geodesics can convert E modes into B modes but in Bianchi V this is not necessarily the case. It is in principle possible, therefore, to generate localized temperature features without violating existing observational constraints on the odd-parity component of the polarization of the cosmic microwave background.

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