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29 March 2024
 
  » arxiv » astro-ph/9801212

 Article overview


Circles in the Sky: Finding Topology with the Microwave Background Radiation
Neil Cornish ; David Spergel ; Glenn Starkman ;
Date 22 Dec 1997
Journal Class.Quant.Grav. 15 (1998) 2657-2670
Subject astro-ph gr-qc hep-th
AffiliationCambridge), David Spergel (Princeton) and Glenn Starkman (Case Western
AbstractIf the universe is finite and smaller than the distance to the surface of last scatter, then the signature of the topology of the universe is writ large on the microwave background sky. We show that the microwave background will be identified at the intersections of the surface of last scattering as seen by different ``copies’’ of the observer. Since the surface of last scattering is a two-sphere, these intersections will be circles, regardless of the background geometry or topology. We therefore propose a statistic that is sensitive to all small, locally homogeneous topologies. Here, small means that the distance to the surface of last scatter is smaller than the ``topology scale’’ of the universe.
Source arXiv, astro-ph/9801212
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