Large scale planemirroring in the cosmic microwave background WMAP5 maps
Abstract
We continue investigation of the hidden planemirror symmetry in the distribution of excursion sets in cosmic microwave background (CMB) temperature anisotropy maps, previously noticed in the threeyear data of the Wilkinson microwave anisotropy probe (WMAP), using the WMAP 5 years maps. The symmetry is shown to have higher significance, χ^{2} < 1.7, for low multipoles ℓ < 5, while disappearing at larger multipoles, χ^{2} > 3.5 for ℓ > 10. The study of the sum and difference maps of temperature inhomogeneity regions, along with simulated maps, confirms its existence. The properties of these mirroring symmetries are compatible with those produced by the SachsWolfe effect in the presence of an anomalously large component of horizonsize density perturbations, independent of one of the spatial coordinates, and/or a slablike spatial topology of the Universe.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 November 2008
 DOI:
 10.1051/00046361:200810747
 arXiv:
 arXiv:0807.3652
 Bibcode:
 2008A&A...490..929G
 Keywords:

 cosmology: cosmic microwave background;
 Astrophysics;
 General Relativity and Quantum Cosmology
 EPrint:
 A&