%0 Journal Article
%T Revisiting longitudinal plasmon-axion conversion in external magnetic fields
%A Caputo, A.
%A Millar, A. J.
%A Vitagliano, E.
%J Physical Review D
%D 2020
%V 101
%N 12
%I Amer Physical Soc
%@ 1550-7998
%G English
%F Caputo_etal2020
%O WOS:000537316000001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4417), last updated on Thu, 18 Jun 2020 11:09:24 +0000
%X In the presence of an external magnetic field, the axion and the photon mix. In particular, the dispersion relation of a longitudinal plasmon always crosses the dispersion relation of the axion (for small axion masses), thus leading to a resonant conversion. Using thermal field theory, we concisely derive the axion emission rate, applying it to astrophysical and laboratory scenarios. For the Sun, depending on the magnetic field profile, plasmon-axion conversion can dominate over Primakoff production at low energies (less than or similar to 200 eV). This both provides a new axion source for future helioscopes and, in the event of discovery, would probe the magnetic field structure of the Sun. In the case of white dwarfs (WDs), plasmon-axion conversion provides a pure photon coupling probe of the axion, which may contribute significantly for low-mass WDs. Finally, we rederive and confirm the axion absorption rate of the recently proposed plasma haloscopes.
%R 10.1103/PhysRevD.101.123004
%U https://arxiv.org/abs/2005.00078
%U https://doi.org/10.1103/PhysRevD.101.123004
%P 123004-13pp