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Observational signatures of anisotropic inflationary models

Journal of Cosmology and Astroparticle Physics, ISSN: 1475-7516, Vol: 2013, Issue: 12, Page: 009-009
2013
  • 64
    Citations
  • 0
    Usage
  • 16
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    64
    • Citation Indexes
      64
  • Captures
    16

Article Description

We study observational signatures of two classes of anisotropic inflationary models in which an inflaton field couples to (i) a vector kinetic term FνFν and (ii) a two-form kinetic term HνλHμνλ. We compute the corrections from the anisotropic sources to the power spectrum of gravitational waves as well as the two-point cross correlation between scalar and tensor perturbations. The signs of the anisotropic parameter g are different depending on the vector and the two-form models, but the statistical anisotropies generally lead to a suppressed tensor-to-scalar ratio r and a smaller scalar spectral index n in both models. In the light of the recent Planck bounds of n and r, we place observational constraints on several different inflaton potentials such as those in chaotic and natural inflation in the presence of anisotropic interactions. In the two-form model we also find that there is no cross correlation between scalar and tensor perturbations, while in the vector model the cross correlation does not vanish. The non-linear estimator f of scalar non-Gaussianities in the two-form model is generally smaller than that in the vector model for the same orders of g |, so that the former is easier to be compatible with observational bounds of non-Gaussianities than the latter. © 2013 IOP Publishing Ltd and Sissa Medialab srl.

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