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Phase analysis of the cosmic microwave background from an incomplete sky coverage
Lung-Yih Chiang, Pavel D. Naselsky
Phases of the spherical harmonic analysis of full-sky cosmic microwave background (CMB) temperature data contain useful information complementary to the ubiquitous angular power sp…
The One-dimensional Fourier Representation and Large Angular Scale Foreground Contamination in the 3-year Wilkinson Microwave Anisotropy Probe data
Lung-Yih Chiang, Peter Coles, Pavel D Naselsky +1
We employ the one-dimensional Fourier representation (1DFR) to analyze the 3-year WMAP de-biased internal linear combination (DILC) map and its possible contamination by galactic f…
Testing Gaussian random hypothesis with the cosmic microwave background temperature anisotropies in the three-year WMAP data
Lung-Yih Chiang, Pavel D. Naselsky, Peter Coles
We test the hypothesis that the temperature of the cosmic microwave background is consistent with a Gaussian random field defined on the celestial sphere, using de-biased internal…
Non-linearity of large-scale structure formation in the Universe
Lung-Yih Chiang
In the standard picture of cosmological structure formation, the Universe we see today is evolved under the gravitational instability from tiny random fluctuations. In this talk I…
Correlations from Galactic foregrounds in the 1-year Wilkinson Microwave Anisotropy Probe WMAP data
Pavel D. Naselsky, Igor D. Novikov, Lung-Yih Chiang
We study a specific correlation in spherical harmonic multipole domain for cosmic microwave background (CMB) analysis. This group of correlation between Δl=4n, n=1,2... is caused b…
Statistics of phase correlations as a test for non-Gaussianity of the CMB maps
Pavel Naselsky, Lung-Yih Chiang, Poul Olesen +1
Gaussianity is the very base for derivation of the cosmological parameters from the CMB angular power spectrum. Non-Gaussian signal, whether originated from experimental error or p…