Anisotropic warm inflation

TL;DR

This paper explores anisotropic warm inflation, analyzing conditions under which anisotropy persists during inflation, and provides exact solutions and phase space analysis to understand the dynamics and survival of anisotropy.

Contribution

It introduces exact solutions for power-law anisotropic warm inflation and examines the conditions affecting anisotropy survival during inflation.

Findings

Anisotropy survival depends on the balance between potential and dissipation.

Exact solutions for power-law anisotropic warm inflation are derived.

Anisotropic warm inflation occurs if dissipation is inefficient.

Abstract

Anisotropic inflation is a model succeeded in explaining statistical anisotropy. Warm inflation is a model succeeded in providing a mechanism of reheating during inflation. We study anisotropic warm inflation focusing on the cosmic no-hair conjecture. In the anisotropic warm inflation, the condition for making anisotropy survived is clarified. By assuming a constant value for the dissipation ratio, we find exact solutions of power-law anisotropic warm inflation, and investigate the phase space structure of general solutions. It turns out that whether the anisotropy during inflation survives or not depends on the competition of the potential that drive anisotropic inflation against dissipation of an inflaton field. Anisotropic warm inflation will be realized if the decaying process is not efficient.