Cosmological CMBR dipole in open universes ?

Details Cosmological CMBR dipole in open universes ? Cosmological CMBR dipole in open universes ?

1997-06-10

arxiv.org/abs/gr-qc/9706024v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

26 pages, Latex, 6 figures, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.55.7389

The observed CMBR dipole is generally interpreted as a Doppler effect arising from the motion of the Earth relative to the CMBR frame. An alternative interpretation, proposed in the last years, is that the dipole results from ultra-large scale isocurvature perturbations. We examine this idea in the context of open cosmologies and show that the isocurvature interpretation is not valid in an open universe, unless it is extremely close to a flat universe, $|\Omega_0 -1|< 10^{-4}$.

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