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2021

Hypermagnetogenesis from axion inflation: Model-independent estimates

Gorbar, E. V., Schmitz, K., Sobol, O. O. et al.

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Axion inflation coupled to the Standard Model (SM) hypercharge gauge sector represents an attractive scenario for the generation of primordial hypermagnetic fields.

The description of this scenario is, however, complicated by the Schwinger effect, which gives rise to highly nonlinear dynamics.
Hypermagnetogenesis during axion inflation in the absence of nonlinear effects is well studied and known to result in a hypermagnetic energy density that scales like $H^4\,e^{2\pi\xi}/\xi^5$, where $\xi$ is proportional to the time derivative of the axion-vector coupling in units of the Hubble rate $H$.
In this paper, we generalize this result to the full SM case by consistently taking into account the Schwinger pair production of all SM fermions.

Hypermagnetogenesis from axion inflation: Model-independent estimates · Around

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