Model-independent test for scale-dependent non-Gaussianities in the cosmic microwave background

C. Raeth*, G. E. Morfill, G. Rossmanith, A. J. Banday, K. M. Gorski

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

We present a model-independent method to test for scale-dependent non-Gaussianities in combination with scaling indices as test statistics. Therefore, surrogate data sets are generated, in which the power spectrum of the original data is preserved, while the higher order correlations are partly randomized by applying a scale-dependent shuffling procedure to the Fourier phases. We apply this method to the Wilkinson Microwave Anisotropy Probe data of the cosmic microwave background and find signatures for non-Gaussianities on large scales. Further tests are required to elucidate the origin of the detected anomalies.

Original languageEnglish
Article number131301
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Volume102
Issue number13
DOIs
Publication statusPublished - 3 Apr 2009

Keywords

  • PROBE SKY MAPS
  • ANISOTROPY-PROBE
  • INFLATIONARY UNIVERSE
  • K-INFLATION
  • WMAP DATA
  • PERTURBATIONS
  • SIGNATURES
  • FLATNESS
  • ISOTROPY
  • HORIZON

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