Statistics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stin...9921321s&link_type=abstract
Technical Report, California Univ. Berkeley, CA United States
Statistics
Microwaves, Background Radiation, Galactic Evolution, Dark Matter, Power Spectra, Discontinuity, Anisotropy, Cosmic Background Explorer Satellite, Hubble Constant, Gravitational Lenses, Interacting Galaxies, Galactic Clusters
Scientific paper
One of the main areas of research is the theory of cosmic microwave background (CMB) anisotropies and analysis of CMB data. Using the four year COBE data we were able to improve existing constraints on global shear and vorticity. We found that, in the flat case (which allows for greatest anisotropy), (omega/H)0 less than 10-7, where omega is the vorticity and H is the Hubble constant. This is two orders of magnitude lower than the tightest, previous constraint. We have defined a new set of statistics which quantify the amount of non-Gaussianity in small field cosmic microwave background maps. By looking at the distribution of power around rings in Fourier space, and at the correlations between adjacent rings, one can identify non-Gaussian features which are masked by large scale Gaussian fluctuations. This may be particularly useful for identifying unresolved localized sources and line-like discontinuities. Levin and collaborators devised a method to determine the global geometry of the universe through observations of patterns in the hot and cold spots of the CMB. We have derived properties of the peaks (maxima) of the CMB anisotropies expected in flat and open CDM models. We represent results for angular resolutions ranging from 5 arcmin to 20 arcmin (antenna FWHM), scales that are relevant for the MAP and COBRA/SAMBA space missions and the ground-based interferometer. Results related to galaxy formation and evolution are also discussed.
No associations
LandOfFree
[Cosmic Microwave Background (CMB) Anisotropies] does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with [Cosmic Microwave Background (CMB) Anisotropies], we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and [Cosmic Microwave Background (CMB) Anisotropies] will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1615601