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Probing Gaussianity represents one of the key questions in modern cosmology,because it allows to discriminate between different models of inflation. Wetest for large-scale non-Gaussianities in the cosmic microwave background (CMB)in a model-independent way. To this end, so-called first and second ordersurrogates are generated by first shuffling the Fourier phases belonging to thescales not of interest and then shuffling the remaining phases for the lengthscales under study. Using scaling indices as test statistics we find highlysignificant signatures for both non-Gaussianities and asymmetries on largescales for the WMAP data of the CMB. We find remarkably similar results whenanalyzing different ILC-maps based on the WMAP five and seven year data. Suchfeatures being independent from the map-making procedure would disfavor thefundamental principle of isotropy as well as canonical single-field slow-rollinflation - unless there is some undiscovered systematic error in thecollection or reduction of the CMB data or yet unknown foregroundcontributions.

Probing non-Gaussianities on Large Scales in WMAP5 and WMAP7 Data using Surrogates