Primer on axion physics
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Abstract
The canonical axion potential is reviewed, with an emphasis on the field theory underlying radial and angular modes of complex scalar fields. The explicit calculation of the instanton-induced breaking of the Goldstone field direction necessary to derive the canonical axion mass and decay constant relation is presented. The primer is intended to serve an audience with elementary quantum field theory expertise.
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Annalen der Physik, Version of Record (VoR), Wiley-VCH, Berlin, 2023, https://doi.org/10.1002/andp.202300106