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The Nature of Primordial Fluctuations from Anisotropic Inflation · Around

2010

The Nature of Primordial Fluctuations from Anisotropic Inflation

Watanabe, Masa-aki, Kanno, Sugumi, Soda, Jiro

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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.

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