Open AccessThe circles‐in‐the‐sky signature for three spherical universes
Author(s) -
Aurich R.,
Lustig S.,
Steiner F.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10296.x
Subject(s) - cosmic microwave background , sky , physics , signature (topology) , space (punctuation) , astrophysics , binary number , scale (ratio) , dodecahedron , cosmic background radiation , astronomy , theoretical physics , optics , geometry , computer science , anisotropy , mathematics , arithmetic , quantum mechanics , operating system
The mysteriously low cosmic microwave background (CMB) power on the largest scales might point to a Universe which consists of a multi‐connected space. In addition to a suppression of large‐scale power, a multi‐connected space can be revealed by its circles‐in‐the‐sky signature. In this paper, a detailed search for this signature is carried out for those three homogeneous multi‐connected spherical space forms that lead to the smallest large‐scale power. A simultaneous search for all occurring paired circles is made using filtered CMB sky maps which enhance the ordinary Sachs–Wolfe contribution. A marginal hint is found for the right‐handed Poincaré dodecahedron at Ω tot ≃ 1.015 and for the right‐handed binary tetrahedral space at Ω tot ≃ 1.068 . However, due to the complicated noise and foreground structure of the available microwave sky maps, we cannot draw firm conclusions from our findings.