Polarized spots in anisotropic open universes

Sung, Rockhee and Coles, Peter ORCID: https://orcid.org/0000-0002-5535-2850 2009. Polarized spots in anisotropic open universes. Classical and Quantum Gravity 26 (17) , 172001. 10.1088/0264-9381/26/17/172001

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Abstract

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 VIIh. Both these models also generate coherent polarization patterns. In Bianchi VIIh, 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 therefore possible, at least in principle, to generate localized temperature features without violating existing observational constraints on the odd-parity component of the cosmic microwave background polarization.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	IOP Publishing
ISSN:	0264-9381
Last Modified:	19 Oct 2022 10:10
URI:	https://orca.cardiff.ac.uk/id/eprint/23474

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