Nature 305, 397 - 402 (29 September 1983); doi:10.1038/305397a0

Structure of the cosmic microwave background

John D. Barrow, R. Juszkiewicz^* & D. H. Sonoda

Astronomy Centre, University of Sussex, Brighton BN1 9QH, UK
^*Permanent address: Copernicus Centre, Bartycka 18, 00715 Warsaw, Poland.

We predict the structure expected in the cosmic microwave background over large angular scales in realistic anisotropic and inhomogeneous universes. In a homogeneous anisotropic universe we find that there exist two possibilities, a quadrupole or a hotspot pattern with and without dipole contributions. A hotspot allows a direct observational test of an open universe. We show how infinite wavelength inhomogeneous perturbations of the Friedman universe can be represented as ensembles of different homogeneous universes.

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