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Is the Universe odd?

Kate Land and João Magueijo
Phys. Rev. D 72, 101302(R) – Published 28 November 2005

Abstract

We investigate the point-parity and mirror-parity handedness of the large angle anisotropy in the cosmic microwave background (CMB). In particular we consider whether the observed low CMB quadrupole could more generally signal odd point-parity, i.e., suppression of even multipoles. Even though this feature is “visually” present in most renditions of the WMAP dataset we find that it never supports parity preference beyond the meagre 95% confidence level. This is fortunate as point-parity handedness implies almost certainly a high level of galactic contamination. Mirror reflection parity, on the contrary, is related to the emergence of a preferred axis, defining the symmetry plane. We use this technique to make contact with recent claims for an anisotropic Universe, showing that the detected preferred axis is associated with positive (even) mirror parity. This feature may be an important clue in identifying the culprit for this unexpected signal.

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  • Received 12 July 2005

DOI:https://doi.org/10.1103/PhysRevD.72.101302

©2005 American Physical Society

Authors & Affiliations

Kate Land1 and João Magueijo2,1

  • 1Theoretical Physics Group, Imperial College, Prince Consort Road, London SW7 2BZ, United Kingdom
  • 2Perimeter Institute for Theoretical Physics, 31 Caroline St. N., Waterloo, N2L 2Y5, Canada

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Issue

Vol. 72, Iss. 10 — 15 November 2005

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