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Constraining Cosmic Topology with CMB Polarization
Alain Riazuelo1, Samuel Caillerie2, M. Lachièze-Rey2, 3, Roland Lehoucq2, Jean-Pierre Luminet4

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.
1 :  IAP - Institut d'Astrophysique de Paris
2 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
3 :  APC - UMR 7164 - AstroParticule et Cosmologie
4 :  LUTH - Laboratoire Univers et Théories
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
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