Global universe anisotropy probed by the alignment of structures in the cosmic microwave background

Wiaux, Yves;Vielva, P.;Martinez-Gonzalez, E.;Vandergheynst, P.
(2006) Physical Review Letters — Vol. 96, p. 151303-151301 (2006)

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Authors
  • Wiaux, YvesUCLouvain
    Author
  • Vielva, P.Instituto de Fisica de Cantabria (CSIC-UC),Spain
    Author
  • Martinez-Gonzalez, E.Instituto de Fisica de Cantabria (CSIC-UC),Spain
    Author
  • Vandergheynst, P.Signal processing institute, Ecole Polytechnique Fédérale de Lausanne, Suisse
    Author
Abstract
We question the global universe isotropy by probing the alignment of local structures in the cosmic microwave background (CMB) radiation. The original method proposed relies on a steerable wavelet decomposition of the CMB signal on the sphere. The analysis of the first-year Wilkinson Microwave Anisotropy Probe data identifies a mean preferred plane with a normal direction close to the CMB dipole axis, and a mean preferred direction in this plane, very close to the ecliptic poles axis. Previous statistical anisotropy results are thereby synthesized, but further analyses are still required to establish their origin.

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Wiaux, Y., Vielva, P., Martinez-Gonzalez, E., & Vandergheynst, P. (2006). Global universe anisotropy probed by the alignment of structures in the cosmic microwave background. Physical Review Letters, 96, 151303-151301. https://doi.org/10.1103/PhysRevLett.96.151303 (Original work published 2006)