Abstract
The existence of magnetic fields in the universe is unmistakable. They are observed at all scales from stars to galaxy clusters. However, the origin of these fields remains enigmatic. It is believed that magnetic field seeds may have emerged from inflation, under certain conditions. This possibility is analised in the context of an alternative theory of gravity with non-minimal coupling between curvature and matter. We find, through the solution of the generalised Maxwell equations in the context of non-minimal models, that for general slow-roll inflationary scenarios with low reheating temperatures, \(T_{RH}\simeq 10^{10}\hbox {GeV}\), the generated magnetic fields can be made compatible with observations at large scales, \(\lambda \sim 1 Mpc\).
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Acknowledgements
FCM thanks support from FCT/Portugal through CAMGSD, IST-ID, project UIDB/04459/2020 and UIDP/04459/2020 as well as CMAT, Univ. Minho, through project UIDB/00013/2020 and UIDP/00013/2020 and FEDER Funds COMPETE.
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Bertolami, O., Lima, M.M. & Mena, F.C. Primordial magnetic fields in theories of gravity with non-minimal coupling between curvature and matter. Gen Relativ Gravit 54, 82 (2022). https://doi.org/10.1007/s10714-022-02968-7
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DOI: https://doi.org/10.1007/s10714-022-02968-7