Improved hot dark matter bound on the QCD axion
High Energy Physics - Phenomenology
2022-11-09 v1 Cosmology and Nongalactic Astrophysics
Abstract
We strengthen the cosmological bound on the axion mass, by solving the momentum-dependent Boltzmann equations for axion-pion scatterings and by using a phenomenological production rate derived from pion-pion scattering data, overcoming the breakdown of chiral perturbation theory. Using present cosmological datasets we obtain . To further improve the bound and exploit the reach of upcoming cosmological surveys, reliable non-perturbative calculations above the QCD crossover are needed.
Cite
@article{arxiv.2211.03799,
title = {Improved hot dark matter bound on the QCD axion},
author = {Alessio Notari and Fabrizio Rompineve and Giovanni Villadoro},
journal= {arXiv preprint arXiv:2211.03799},
year = {2022}
}
Comments
6+8 pages, 7 figures