Probing Cosmic topology using CMB anisotropy

Details Probing Cosmic topology using CMB anisotropy Probing Cosmic topology using CMB anisotropy

1998-04-04

arxiv.org/abs/astro-ph/9804042v1

Astronomy and Astrophysics

Astrophysics

4 Pages, Proc. of XXXIIIrd Recontres de Moriond "Fundamental Parameters in Cosmology", Jan. 17-24,1998, Les Arc, France

Scientific paper

The measurements of CMB anisotropy have opened up a window for probing the global topology of the universe on length scales comparable to and beyond the Hubble radius. We have developed a new method for calculating the CMB anisotropy in models with nontrivial topology and apply it to open universe models with compact spatial topology. We conduct a Bayesian probability analysis for a selection of models which confronts the theoretical pixel-pixel temperature correlation function with the COBE-DMR data. Our results demonstrate that strong constraints on compactness arise: if the universe is small compared to the `horizon' size, correlations appear in the maps that are irreconcilable with the observations.

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