A model-independent test for scale-dependent non-Gaussianities in the CMB

Details A model-independent test for scale-dependent non-Gaussianities in the CMB A model-independent test for scale-dependent non-Gaussianities in the CMB

2008-10-21

arxiv.org/abs/0810.3805v2

Phys. Rev. Lett., 102, 131301 (2009)

Astronomy and Astrophysics

Astrophysics

accepted for publication in PRL, minor revisions, results unchanged, l(cut)-dependency added

Scientific paper

10.1103/PhysRevLett.102.131301

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 randomised by applying a scale-dependent shuffling procedure to the Fourier phases. We apply this method to the WMAP data of the cosmic microwave background (CMB) and find signatures for non-Gaussianities on large scales. Further tests are required to elucidate the origin of the detected anomalies.

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