Accounting for Birch's observed anisotropy of the universe: cosmological rotation?

Details Accounting for Birch's observed anisotropy of the universe: cosmological rotation? Accounting for Birch's observed anisotropy of the universe: cosmological rotation?

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jetp...74..411p&link_type=abstract

Sov. Phys. - JETP, Vol. 74, No. 3, p. 411 - 415

Mathematics

Logic

5

Scientific paper

The authors have investigated the effect of spacetime curvature on the relative position angle Δ between the direction of maximum elongation of a radio source and the direction of the integrated plane of polarization for emission that has propagated from a source to the observer. A more detailed analysis has been carried out for a cosmological model with global rotation (Gödel-type metric). In contrast to recent ideas about the origin of the dipole anisotropy in Δ first proposed by Birch and ascribed by him to the global rotation of the universe, the authors have found that such rotation cannot induce the sort of anisotropy described by Birch, with Δ ≡ cosθ (θ is the angle between a ray and the rotation axis). Instead, the authors expect anisotropy with Δ ≡ sin2θ. They therefore conclude that the Birch effect, if real, cannot be due to the rotation of the universe.

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