Anisotropy in Inflation with Non-minimal Coupling

TL;DR

This paper introduces a new anisotropic inflation model with a nonminimally coupled inflaton and vector field, revealing the existence of anisotropic attractor solutions in both weak and strong curvature coupling regimes, with suppressed anisotropy in the latter.

Contribution

It demonstrates the existence of anisotropic attractor solutions in a novel inflation model with nonminimal coupling, extending previous understanding to strong coupling regimes.

Findings

Anisotropic attractor solutions exist in both weak and strong curvature coupling limits.

Anisotropy contribution is greatly suppressed in the strong coupling limit.

The model broadens the scope of anisotropic inflation scenarios.

Abstract

We study a new anisotropic inflation model, with an inflaton field nonminimally coupled with the gravity and a vector field. We find that the anisotropic attractor solution exists not only in the weak curvature coupling limit, but more interestingly in the strong curvature coupling limit as well. We show that in the strong curvature coupling limit, the contribution from the anisotropy is greatly suppressed.