How Anisotropic is our Universe?

Details How Anisotropic is our Universe? How Anisotropic is our Universe?

1996-05-20

arxiv.org/abs/astro-ph/9605123v1

Phys.Rev.Lett.77:2883-2886,1996

Astronomy and Astrophysics

Astrophysics

12 pages (1 figure), uses RevTex and psfig, submitted to PRL

Scientific paper

10.1103/PhysRevLett.77.2883

Large-scale cosmic microwave background anisotropies in homogeneous, globally anisotropic cosmologies are investigated. We perform a statistical analysis in which the four-year data from the Cosmic Background Explorer satellite is searched for the specific anisotropy patterns predicted by these models and thereby set definitive upper limits on the amount of shear, $(\sigma/H)_0$ and vorticity, $(\omega/H)_0$, which are orders of magnitude stronger than previous constraints. We comment on how these results might impact our understanding of primordial global anisotropy.

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