http://arxiv.org/abs/2103.07625
Axion-like particles (ALPs) are a compelling candidate for dark matter (DM). Their production is associated with the formation of a string-wall network. This system must annihilate, producing gravitational waves and non-relativistic ALPs. We show that these gravitational waves, if produced at temperatures below 100 eV, could be detected by future cosmological probes for ALPs with mass from $10^{-16}$ to $10^{6}$ eV that could constitute the entirety of the DM.
G. Gelmini, A. Simpson and E. Vitagliano
Tue, 16 Mar 21
39/92
Comments: 7 pages, 3 figures
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