First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Tests of Gaussianity

Details First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Tests of Gaussianity First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Tests of Gaussianity

2003-02-11

arxiv.org/abs/astro-ph/0302223v2

Astrophys.J.Suppl.148:119-134,2003

Astronomy and Astrophysics

Astrophysics

Replaced with version accepted by ApJ. One of thirteen companion papers on first-year WMAP results; 35 pages, 9 figures; a ver

Scientific paper

10.1086/377220

We present limits to the amplitude of non-Gaussian primordial fluctuations in the WMAP 1-year cosmic microwave background sky maps. A non-linear coupling parameter, f_NL, characterizes the amplitude of a quadratic term in the primordial potential. We use two statistics: one is a cubic statistic which measures phase correlations of temperature fluctuations after combining all configurations of the angular bispectrum. The other uses the Minkowski functionals to measure the morphology of the sky maps. Both methods find the WMAP data consistent with Gaussian primordial fluctuations and establish limits, -58

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