The Complete Bispectrum of COBE-DMR Four Year Maps

Abstract

We extend a previous bispectrum analysis of the COBE-DMR 4 year maps, allowing for the presence of correlations between all possible angular scales. We find that the non-Gaussian signal found earlier for bispectrum components including adjacent modes does not extend to triplets of modes with larger separations. Indeed for all separations $\Delta \ell >1$ we find that the COBE-DMR data is very Gaussian. The implication seems to be that the previously detected non-Gaussian scale-scale correlation falls off very quickly with mode separation.

10 pages, 5 figures

References in corpus (2)

• Testing the Gaussianity of the COBE-DMR data with spherical wavelets
• Statistical Power, the Bispectrum and the Search for Non-Gaussianity in the CMB Anisotropy

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• COBE-DMR constraints on the nonlinear coupling parameter: a wavelet based method
• Phase Mapping as a Powerful Diagnostic of Primordial Non-Gaussianity
• Fast n-point correlation functions and three-point lensing application
• Long range correlation in cosmic microwave background radiation
• Characteristic Angular Scales in Cosmic Microwave Background Radiation
• On the bispectrum of COBE and WMAP
• Non-Gaussian Foreground Residuals of the WMAP First Year Maps
• Analysing large scale structure: II. Testing for primordial non-Gaussianity in CMB maps using surrogates
• The N-point correlation functions of the COBE-DMR maps revisited