2006/01/19 by Alain Riazuelo, Samuel Caillerie, Riazuelo, Alain +7
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #FOS: Physical sciences #Geophysics and Gravity Measurements #Radio Astronomy Observations and Technology
paper · pdf · doi:10.48550/arxiv.astro-ph/0601433
openalex publication_date 2006/01/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Multiply connected space sections of the universe on a scale smaller than the horizon size can leave an imprint on cosmic microwave background polarization maps, in such a way that the so-called ``circles-in-the-sky'' method can be used to detect or constrain the topology. We investigate some specific cases, namely toroidal and sixth-turn spaces, in order to show the influence of topology on CMB polarization. The correlation between matched points happens to be always positive and higher than 75% regardless of the angular scale and of the cosmological parameters, except for reionization. This figure is better than what occurs in temperature maps, but is achieved only in the absence of noise. It is only slightly reduced by the filtering scheme.