Constraining primordial non-gaussianities from the WMAP2 2-1 cumulant correlator power spectrum

Gang Chen, István Szapudi

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We measure the 2-1 cumulant correlator power spectrum C1 21, a degenerate bispectrum, from the second data release of the Wilkinson Microwave Anisotropy Probe (WMAP). Our high-resolution measurements with SpICE span a large configuration space (≃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 χ2 to obtain constraints for the nonlinear coupling parameter fNL = 22 ± 52 (1 σ).

Original languageEnglish
Pages (from-to)L87-L90
JournalAstrophysical Journal
Volume647
Issue number2 II
DOIs
Publication statusPublished - Aug 20 2006

Keywords

  • Cosmic microwave background
  • Cosmology: theory
  • Methods: statistical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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