Cosmological axion bounds
Steen Hannestad, Jan Hamann, Alessandro Mirizzi, Georg G. Raffelt,, Yvonne Y.Y. Wong
TL;DR
This paper reviews current and future cosmological constraints on axions, focusing on their roles as hot and cold dark matter, and discusses the implications of Peccei-Quinn symmetry breaking during reheating.
Contribution
It provides a comprehensive overview of existing bounds and explores future prospects for detecting axions as dark matter candidates, especially in scenarios with broken Peccei-Quinn symmetry.
Findings
Current bounds on axion hot dark matter
Projected sensitivities for axion cold dark matter
Implications of Peccei-Quinn symmetry breaking during reheating
Abstract
We discuss current cosmological constraints on axions, as well as future sensitivities. Bounds on axion hot dark matter are discussed first, and subsequently we discuss both current and future sensitivity to models in which axions play the role as cold dark matter, but where the Peccei-Quinn symmetry is not restored during reheating.
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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Cosmology and Gravitation Theories · Particle physics theoretical and experimental studies