Effective treatment of U(1) gauge field and charged particles in axion inflation

Tomohiro Fujita, Jun'ya Kume, Kyohei Mukaida, Yuichiro Tada

研究成果: Article査読

8 被引用数 (Scopus)


The axionic inflaton with the Chern-Simons coupling may generate U(1) gauge fields and charged particles simultaneously. In order to incorporate the backreaction from the charged particles on the gauge fields, we develop a procedure to obtain an equilibrium solution for the gauge fields by treating the induced current as effective electric and magnetic conductivities. Introducing mean field approximation, and numerically solving self-consistency equations, we find that the gauge field amplitudes are drastically suppressed. Interestingly, as the production becomes more efficient, the charged particles gain a larger part of the transferred energy from the inflaton and eventually dominate it. Our formalism offers a basis to connect this class of inflationary models to a rich phenomenology such as baryogenesis and magnetogenesis.

ジャーナルJournal of Cosmology and Astroparticle Physics
出版ステータスPublished - 2022 9月 1

ASJC Scopus subject areas

  • 天文学と天体物理学


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