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How Anisotropic is our Universe?
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abstract
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.
Forward citations
Cited by 2 Pith papers
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The Cosmological Dipole in Tilted Anisotropic Universes
In tilted Bianchi cosmologies, a 10^-3 dipole is impossible under current shear and curvature bounds except possibly for a Khronon field.
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Probing the Cosmological Principle with weak lensing shear
A Euclid-like weak lensing survey could detect the E-B shear cross-correlation produced by late-time anisotropic expansion, yielding a new probe of the Cosmological Principle.
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