Have Acoustic Oscillations been Detected in the Current Cosmic Microwave Background Data?
ArXiv astro-ph/0111400 (2001)
Abstract:
The angular power spectrum of the Cosmic Microwave Background has been measured out to sufficiently small angular scale to encompass a few acoustic oscillations. We use a phenomenological fit to the angular power spectrum to quantify the statistical significance of these oscillations and discuss the cosmological implications of such a finding.The Trispectrum of the 4 Year COBE-DMR data
(2001)
The Trispectrum of the 4 Year COBE-DMR data
ArXiv astro-ph/0111250 (2001)
Abstract:
We propose an estimator for the trispectrum of a scalar random field on a sphere, discuss its geometrical and statistical properties, and outline its implementation. By estimating the trispectrum of the 4 year COBE-DMR data (in HEALPix pixelization) we find new evidence of a non-Gaussian signal associated with a known systematic effect. We find that by removing data from the sky maps for those periods of time perturbed by this effect, the amplitudes of the trispectrum coefficients become completely consistent with predictions for a Gaussian sky. These results reinforce the importance of statistical methods based in harmonic space for quantifying non-Gaussianity.A High Spatial Resolution Analysis of the MAXIMA-1 Cosmic Microwave Background Anisotropy Data
The Astrophysical Journal American Astronomical Society 561:1 (2001) l1-l5
Cosmological Implications of the MAXIMA-1 High-Resolution Cosmic Microwave Background Anisotropy Measurement
The Astrophysical Journal American Astronomical Society 561:1 (2001) l7-l10