Simple Types of Anisotropic Inflation

Details Simple Types of Anisotropic Inflation Simple Types of Anisotropic Inflation

2009-11-19

arxiv.org/abs/0911.3805v2

Phys.Rev.D81:023513,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8pages, 3 figs v2:refs added, typos fixed

Scientific paper

10.1103/PhysRevD.81.023513

We display some simple cosmological solutions of gravity theories with quadratic Ricci curvature terms added to the Einstein-Hilbert lagrangian which exhibit anisotropic inflation. The Hubble expansion rates are constant and unequal in three orthogonal directions. We describe the evolution of the simplest of these homogeneous and anisotropic cosmological models from its natural initial state and evaluate the deviations they will create from statistical isotropy in the fluctuations produced during a period of anisotropic inflation. The anisotropic inflation is not a late-time attractor in these models but the rate of approach to a final isotropic de Sitter state is slow and is conducive to the creation of observable anisotropic statistical effects in the microwave background. The statistical anisotropy would not be scale invariant and the level of statistical anisotropy will grow with scale.

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