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2014

Inflationary dilaton-axion magnetogenesis

Cheng, Shu-Lin, Lee, Wolung, Ng, Kin-Wang

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We discuss the generation of primordial magnetic fields during inflation in the dilaton-axion electromagnetism, in which the dilaton and axion dynamics are introduced in terms of two time dependent functions of the cosmic scale factor, $I(a) F^2/4$ and $J(a) F\tilde{F}/4$, respectively, where $F$ is the electromagnetic field strength and $\tilde{F}$ is its dual.

We study the form of $J(a)$ that can generate a large seed magnetic field in the weak coupling regime, $I(a)<1$.
Although the $J(a)$ function is model dependent, the axion-photon coupling indeed opens up a new window for a successful inflationary magnetogenesis.

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