Speaker
Description
Some of the strongest constraints on axions and dark photons (DPs) come from their emission in astrophysical plasmas. However, many of these studies assume isotropic plasma conditions, which are rarely realized in realistic environments due to the ubiquitous presence of magnetic fields. In magnetized plasmas, the standard transverse and longitudinal photon polarization modes become mixed, leading to new propagation eigenmodes. In this talk, I will present a general formalism to determine these modified normal modes and their couplings to axions and DPs in anisotropic magnetized media. Using magnetic white dwarfs (MWDs) as a case study, I will demonstrate how magnetic dispersion modifies the resonance structure and leads to strongly directional emission, extending or reshaping the regions where resonant production can occur inside the star.