Large Scale Plane-Mirroring in the Cosmic Microwave Background WMAP5 Maps

Abstract

We continue investigation of the hidden plane-mirror symmetry in the distribution of excursion sets in cosmic microwave background (CMB) temperature anisotropy maps, previously noticed in the three-year 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 \ell < 5, while disappearing at larger multipoles, χ^2 > 3.5 for \ell > 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 Sachs-Wolfe effect in the presence of an anomalously large component of horizon-size density perturbations, independent of one of the spatial coordinates, and/or a slab-like spatial topology of the Universe.

A&A accepted

References in corpus (2)

• Hemispherical power asymmetry in the three-year Wilkinson Microwave Anisotropy Probe sky maps
• On Axial and Plane--Mirror Inhomogeneities in the WMAP3 Cosmic Microwave Background Maps

Cited by in corpus (5)

• Kolmogorov cosmic microwave background sky
• Kolmogorov stochasticity parameter measuring the randomness in Cosmic Microwave Background
• Porosity criterion for hyperbolic voids and the cosmic microwave background
• Flat Universe with Hyperbolic Voids
• Plane-mirroring anomaly in the cosmic microwave background maps