Primordial power spectra from anisotropic inflation

By Tim Dulaney, Moira I. Gresham. 2010

138 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/bb27da5882c12ff62d258c63cbde455dd8a42115

How researchers see this paper

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In Astronomy and Astrophysics

1. Jiro Soda
2. A. Maleknejad
3. M. Sheikh-Jabbari
4. E. Komatsu
5. C. Caprini
6. Marco Peloso

In Nuclear and High Energy Physics

1. Jiro Soda
2. A. Maleknejad
3. M. Sheikh-Jabbari
4. E. Komatsu

Citations in the corpus

• Gauge fields and inflation (2012, background): “We are now in a position to calculate corrections to power spectrum of various variables due to the anisotropy [115, 116, 117].”