☆ 4.7 Article

Is the cold spot responsible for the CMB North-South asymmetry?

PHYSICAL REVIEW D (2009)

Journal

PHYSICAL REVIEW D

Volume 80, Issue 12, Pages -

Publisher

AMER PHYSICAL SOC

DOI: 10.1103/PhysRevD.80.123010

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Astronomy & Astrophysics Physics, Particles & Fields

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Abstract

Several intriguing phenomena, unlikely within the standard inflationary cosmology, were reported in the cosmic microwave background (CMB) data from the Wilkinson Microwave Anisotropy Probe and appear to be uncorrelated. Two of these phenomena, termed CMB anomalies, are representative of their disparate nature: the North-South asymmetry in the CMB angular-correlation strength, inconsistent with an isotropic universe, and the cold spot, producing a significant deviation from Gaussianity. We find a correlation between them, at medium angular scales (l=11-20): we show that a successive diminution of the cold spot (absolute value) temperature implies a monotonic decrease of the North-South asymmetry power, and moreover we find that the cold spot supplies 60% of such power.

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