Primordial Power Spectra from Anisotropic Inflation

Details Primordial Power Spectra from Anisotropic Inflation Primordial Power Spectra from Anisotropic Inflation

2010-01-14

arxiv.org/abs/1001.2301v4

Phys.Rev.D81:103532,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

25 pages, 2 figures; References added, typos corrected and some discussion expanded; version submitted for publication in PRD

Scientific paper

10.1103/PhysRevD.81.103532

We examine cosmological perturbations in a dynamical theory of inflation in which an Abelian gauge field couples directly to the inflaton, breaking conformal invariance. When the coupling between the gauge field and the inflaton takes a specific form, inflation becomes anisotropic and anisotropy can persist throughout inflation, avoiding Wald's no-hair theorem. After discussing scenarios in which anisotropy can persist during inflation, we calculate the dominant effects of a small persistent anisotropy on the primordial gravitational wave and curvature perturbation power spectra using the "in-in" formalism of perturbation theory. We find that the primordial power spectra of cosmological perturbations gain significant direction dependence and that the fractional direction dependence of the tensor power spectrum is suppressed in comparison to that of the scalar power spectrum.

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