The Nature of Primordial Fluctuations from Anisotropic Inflation
By Masa-aki Watanabe, Sugumi Kanno, Jiro Soda. 2010
223 citations recorded by the source corpus.
We study the statistical nature of primordial fluctuations from an anisotropic inflation which is realized by a vector field coupled to an inflaton. We find a suitable gauge, which we call the canonical gauge, for anisotropic inflation by generalizing the flat slicing gauge in conventional isotropic inflation. Using the canonical gauge, we reveal the structure of the couplings between curvature perturbations, vector waves, and gravitational waves. We identify two sources of anisotropy, i.e. the anisotropy due to the anisotropic expansion of the universe and that due to the anisotropic couplings among variables. It turns out that the latter effect is dominant. Since the coupling between the curvature perturbations and vector waves is the strongest one, the statistical anisotropy in the curvature perturbations is larger than that in gravitational waves. We find the cross correlation between the curvature perturbations and gravitational waves which never occurs in conventional inflation. We also find the linear polarization of gravitational waves. Finally, we discuss cosmological implication of our results.
Subfields: Astronomy and Astrophysics, Statistical and Nonlinear Physics
View Paper: https://www.semanticscholar.org/paper/94ae44f3a023a148b471e42ad1e6bfe3e84fa8a8
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In Astronomy and Astrophysics
In Statistical and Nonlinear Physics
Citations in the corpus
- Gauge fields and inflation (2012, methodology): “) In order to calculate the statistical properties of primordial fluctuations from anisotropic inflation [115, 116, 117], we need to reduce the action to the one for physical variables.”