Statistical Anisotropy from Anisotropic Inflation

Details Statistical Anisotropy from Anisotropic Inflation Statistical Anisotropy from Anisotropic Inflation

2012-01-31

arxiv.org/abs/1201.6434v2

Physics

High Energy Physics

High Energy Physics - Theory

32 pages, 5 figures, invited review for CQG, published version

Scientific paper

We review an inflationary scenario with the anisotropic expansion rate. An anisotropic inflationary universe can be realized by a vector field coupled with an inflaton, which can be regarded as a counter example to the cosmic no-hair conjecture. We show generality of anisotropic inflation and derive a universal property. We formulate cosmological perturbation theory in anisotropic inflation. Using the formalism, we show anisotropic inflation gives rise to the statistical anisotropy in primordial fluctuations. We also explain a method to test anisotropic inflation using the cosmic microwave background radiation (CMB).

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