Axion Kinetic Misalignment Mechanism
High Energy Physics - Phenomenology
2020-07-21 v2 Cosmology and Nongalactic Astrophysics
Abstract
In the conventional misalignment mechanism, the axion field has a constant initial field value in the early universe and later begins to oscillate. We present an alternative scenario where the axion field has a nonzero initial velocity, allowing an axion decay constant much below the conventional prediction from axion dark matter. This axion velocity can be generated from explicit breaking of the axion shift symmetry in the early universe, which may occur as this symmetry is approximate.
Keywords
Cite
@article{arxiv.1910.14152,
title = {Axion Kinetic Misalignment Mechanism},
author = {Raymond T. Co and Lawrence J. Hall and Keisuke Harigaya},
journal= {arXiv preprint arXiv:1910.14152},
year = {2020}
}
Comments
7+4 pages, 2+2 figures; v2: Supplemental Material and references added, matches journal version