Axion-like particle dark matter and gravitational waves from topological defects

by Edoardo Vitagliano

Thursday 17 Jun 2021, 16:00 → 17:00 Australia/Sydney

Axion-like particle dark matter and gravitational waves from topological defects 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. In my talk I will 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, opening a window on ALP DM with arbitrary small couplings to the Standard Model.