Anisotropic Non-Gaussianity from a Two-Form Field

Understand

We study an inflationary scenario with a two-form field to which an inflaton couples non-trivially.

• First, we show that anisotropic inflation can be realized as an attractor solution and that the two-form hair remains during inflation.
• A statistical anisotropy can be developed because of a cumulative anisotropic interaction induced by the background two-form field.
• The power spectrum of curvature perturbations has a prolate-type anisotropy, in contrast to the vector models having an oblate-type anisotropy.