Does Anisotropic "Inflation" Produce a Small Statistical Anisotropy?
Cosmology and Nongalactic Astrophysics
2018-02-14 v1 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
Anisotropic inflation is an interesting model with an U(1) gauge field and it predicts the statistical anisotropy of the curvature perturbation characterized by a parameter . However, we find that the background gauge field does not follow the classical attractor solution due to the stochastic effect. We develop the stochastic formalism of a vector field and solve Langevin and Fokker-Planck equations. It is shown that this model is excluded by the CMB constraint with a high probability about .
Cite
@article{arxiv.1711.11539,
title = {Does Anisotropic "Inflation" Produce a Small Statistical Anisotropy?},
author = {Tomohiro Fujita and Ippei Obata},
journal= {arXiv preprint arXiv:1711.11539},
year = {2018}
}