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The fluctuations of the cosmic microwave background (CMB) are investigatedfor a small open universe, i.e., one which is periodically composed of a smallfundamental cell. The evolution of initial metric perturbations is computedusing the first 749 eigenmodes of the fundamental cell in the framework oflinear perturbation theory using a mixture of radiation and matter. Thefluctuations of the CMB are investigated for various density parameters Omega_0taking into account the full Sachs-Wolfe effect. The corresponding angularpower spectrum C_l is compared with recent experiments.

The Fluctuations of the Cosmic Microwave Background for a Compact Hyperbolic Universe