5 papers
Lectures on Light Particles and Compact Objects
Alessandro Lella, Jamie McDonald
This document is based on lectures delivered at a recent COSMIC WISPers COST Action training school in Annecy in September 2025. They examine detection of weakly interacting slim p…
Stellar Superradiance and Low-Energy Absorption in Dense Nuclear Media
Zhaoyu Bai, Vitor Cardoso, Yifan Chen +3
Ultralight bosons such as axions and dark photons are well-motivated hypothetical particles, whose couplings to ordinary matter can be effectively constrained by stellar cooling. L…
Axion-Photon Mixing in 3D: Classical Equations and Geometric Optics
J. I. McDonald, P. Millington
Light particle-photon mixing in magnetised plasmas plays a vital role in constraining the existence of new physics, especially axions, dark photons, and ultra-high-frequency gravit…
Adiabatic Axion-Photon Mixing Near Neutron Stars
Jonas Tjemsland, Jamie McDonald, Samuel J. Witte
One of the promising new proposals to search for axions in astrophysical environments is to look for narrow radio lines produced from the resonant conversion of axion dark matter f…
Generalized Ray Tracing for Axions in Astrophysical Plasmas
J. I. McDonald, S. J. Witte
Ray tracing plays a vital role in black hole imaging, modeling the emission mechanisms of pulsars, and deriving signatures from physics beyond the Standard Model. In this work we f…