Axions as Hot and Cold Dark Matter
High Energy Physics - Phenomenology
2014-03-03 v1 Cosmology and Nongalactic Astrophysics
Abstract
The presence of a hot dark matter component has been hinted at 3 sigma by a combination of the results from different cosmological observations. We examine a possibility that pseudo Nambu-Goldstone bosons account for both hot and cold dark matter components. We show that the QCD axions can do the job for the axion decay constant f_a < O(10^10) GeV, if they are produced by the saxion decay and the domain wall annihilation. We also investigate the cases of thermal QCD axions, pseudo Nambu-Goldstone bosons coupled to the standard model sector through the Higgs portal, and axions produced by modulus decay.
Keywords
Cite
@article{arxiv.1310.1774,
title = {Axions as Hot and Cold Dark Matter},
author = {Kwang Sik Jeong and Masahiro Kawasaki and Fuminobu Takahashi},
journal= {arXiv preprint arXiv:1310.1774},
year = {2014}
}
Comments
24 pages, 1 figure