Improved Measurement of the Angular Power Spectrum of Temperature Anisotropy in the Cosmic Microwave Background from Two New Analyses of BOOMERANG Observations

Abstract

We report the most complete analysis to date of observations of the cosmic microwave background (CMB) obtained during the 1998 flight of BOOMERANG. We use two quite different methods to determine the angular power spectrum of the CMB in 20 bands centered at l = 50 1000, applying them to similar to50% more data than has previously been analyzed. The power spectra produced by the two methods are in good agreement with each other and constitute the most sensitive measurements to date over the range 300 < l < 1000. The increased precision of the power spectrum yields more precise determinations of several cosmological parameters than previous analyses of BOOMERANG data. The results continue to support an inflationary paradigm for the origin of the universe, being well fitted by a similar to13.5 Gyr old,. at universe composed of approximately 5% baryonic matter, 30% cold dark matter, and 65% dark energy, with a spectral index of initial density perturbations n(s) similar to1.

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Affiliated Institutions

• Centre National de la Recherche Scientifique FR
• Istituto Nazionale di Geofisica e Vulcanologia IT
• Lawrence Berkeley National Laboratory US
• Canadian Institute for Theoretical Astrophysics CA
• California Institute of Technology US
• California State University, Dominguez Hills US
• Sapienza University of Rome IT
• Institut d'Astrophysique de Paris FR
• Imperial College London GB
• Case Western Reserve University US
• University of Toronto CA
• University of California, Santa Barbara US
• Cardiff University GB
• University of Alberta CA

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