Echos of the Early Universe in Axion Haloscopes

by Nick Rodd

Tuesday 24 Oct 2023, 13:00 → 14:00 Europe/Stockholm

FR4 (Oskar Klein Auditorium) (AlbaNova Main Building)

The coming decade will bring dramatic improvement in the axion dark-matter program as new experimental designs move beyond the proof of principle stage. In this talk I will outline two signals beyond dark matter that these instruments could discover. The first is a population of relativistic axions that were produced in the early universe and persist as a residual Cosmic axion Background (CaB). The second is high-frequency gravitational waves; I will outline how exploiting an analogy between axion and gravitational-wave electrodynamics allows for axion haloscopes to be converted into gravitational-wave telescopes.