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Problems with large scale primordial magnetic fields

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If you have a question about this talk, please contact Camille Bonvin.

I argue that post-inflationary primordial mechanisms (e.g. cosmological phase transitions) cannot lead to large scale coherent magnetic fields. I then show that also magnetic fields from inflation are severely constrained since they initiate large fluctuations in the geometry during the transition from inflation to the radiation era.

This talk is part of the Cosmology Lunch series.

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