Heavy QCD axion model in light of pulsar timing arrays
High Energy Physics - Phenomenology
2023-12-18 v2 Cosmology and Nongalactic Astrophysics
High Energy Astrophysical Phenomena
General Relativity and Quantum Cosmology
Abstract
Recently, pulsar timing array experiments reported the observation of a stochastic gravitational wave background in the nanohertz range frequency band. We show that such a signal can be originated from a cosmological first-order phase transition (PT) within a well-motivated heavy (visible) QCD axion model. Considering the Peccei-Quinn symmetry breaking at the TeV scale in the scenario, we find a supercooled PT, in the parameter space of the model, prolonging the PT with the reheating temperature at the GeV scale.
Keywords
Cite
@article{arxiv.2307.12385,
title = {Heavy QCD axion model in light of pulsar timing arrays},
author = {Moslem Ahmadvand and Ligong Bian and Soroush Shakeri},
journal= {arXiv preprint arXiv:2307.12385},
year = {2023}
}
Comments
v2: 8 pages, 4 figures, new discussions and references added