Constraining Primordial Non-Gaussianities From The WMAP2 2-1 Cumulant Correlator Power Spectrum

Details Constraining Primordial Non-Gaussianities From The WMAP2 2-1 Cumulant Correlator Power Spectrum Constraining Primordial Non-Gaussianities From The WMAP2 2-1 Cumulant Correlator Power Spectrum

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7704c&link_type=abstract

American Astronomical Society Meeting 210, #77.04; Bulletin of the American Astronomical Society, Vol. 39, p.184

Astronomy and Astrophysics

Astronomy

Scientific paper

We measure the 2-1 cumulant correlator power spectrum, a degenerate bispectrum, from the second data release of the Wilkinson Microwave Anisotropy Probe (WMAP). Our high resolution measurements span a large configuration space (about 168*999) corresponding to the possible cross-correlations of the maps recorded by the different differencing assemblies. We present a novel method to recover the eigenmodes of the correspondingly large Monte Carlo covariance matrix. We examine its eigenvalue spectrum and use random matrix theory to show that the off diagonal terms are dominated by noise. We minimize the chi square to obtain constraints for the non-linear coupling parameter f_NL = 22 ± 52 (1 sigma).

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