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Revisiting longitudinal plasmon-axion conversion in external magnetic fields | | Andrea Caputo
; Alexander J. Millar
; Edoardo Vitagliano
; | | Date: |
30 Apr 2020 | | Abstract: | 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 ($lesssim 200,$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. | | Source: | arXiv, 2005.0078 | | Services: | Forum | Review | PDF | Favorites | |
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