Recent results from the satellite WMAP contains information not only about matter and radiation of the primordial universe, but also contain the imprints of its glogal (or topological) properties, that is about its shape. One way to discover them is through the Pair Angular-Separation Histograms of cosmic point-like sources, which show slight -but noticeable- differences when performed for simulated sources in simple and in multiply connected spaces. From the observational point of view, an excellent cosmic source candidate for these histograms -due to its extremely accuracy never before achieved- are the maps of equal temperature of the recent measured cosmic microwave background radiation, coming not only from WMAP satellite but also from the BEAST project. However, these data are not full-sky surveys mainly due to the interference of our galaxy. For this reason the histograms analysis has to be prepared to deal with these type of data. We analyze the Pair Angular-Separation Histograms for data contained around the celestial poles, and show the imprints that multiply connected properties of the space leave in these histograms. This study led us to use the temperature maps of the CMBR maps -from the WMAP satellite- to look for the shape of the Universe.
Bulletin of the Astronomical Society of Brazil
- Pub Date:
- August 2003