Table of Contents
Universe, Volume 2, Issue 1 (March 2016)
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Cover Story (view full-size image) As proposed by Jean-Pierre Luminet and collaborators, spatially homogeneous universes with [...] Read more. As proposed by Jean-Pierre Luminet and collaborators, spatially homogeneous universes with non-trivial topology and small finite volume – popularly known as "wraparound universes" - provide plausible relativistic cosmological models for describing the true shape of our universe. In such spaces, topological lensing may produce "ghost" images of faraway astronomical sources and specific correlations in the anisotropies of the cosmic microwave background. As a pedestrian illustration, this numerical simulation calculates the closest ghost images of the Earth that would be seen in the Weeks space, which has the smallest possible volume of any closed hyperbolic manifold. Recent astronomical observations from WMAP and Planck telescopes give strong constraints on the simplest models of wraparound universes, but do not exclude the full set of multiply-connected topologies. Image courtesy J. Weeks. View this paper