Temperature correlations in a compact hyperbolic universe

The effect of a non-trivial topology on the temperature correlations on the cosmic microwave background (CMB) in a small compact hyperbolic universe with volume comparable to the cube of the curvature radius is investigated. Because the bulk of large-angular CMB fluctuations is produced at the late epoch in low $Ω_0$ models, the effect of a long wavelength cut-off due to the periodic structure does not lead to the significant suppression of large-angular power as in compact flat models. The angular power spectra are consistent with the COBE data for $Ω_0 \ge 0.1$.

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