Anisotropic warm inflation

Sugumi Kanno (Department of Physics, Kyushu University, Fukuoka 819-0395, Japan) ; Ann Nakato (Department of Physics, Kobe University, Kobe 657-8501, Japan) ; Jiro Soda (Department of Physics, Kobe University, Kobe 657-8501, Japan) ; Kazushige Ueda (Department of Physics, Kyushu University, Fukuoka 819-0395, Japan)

Anisotropic inflation is a model that succeeded in explaining statistical anisotropy. Warm inflation is a model that 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 survive 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 drives anisotropic inflation against dissipation of an inflaton field. Anisotropic warm inflation will be realized if the decaying process is not efficient.

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Published on:
17 March 2023
Publisher:
APS
Published in:
Physical Review D , Volume 107 (2023)
Issue 6
DOI:
https://doi.org/10.1103/PhysRevD.107.063524
arXiv:
2209.05776
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

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