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The most simple models of cosmological inflation consider only one scalar field. However, there are more complex models (like hybrid inflation or multi-field inflation) which consider more than one field.

My question is: Would these fields be governed by radically different laws of physics? Would these fields be described by different fundamental theories?

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  • $\begingroup$ What d'you mean by 'governed by different laws of physics'? I'm not sure how single field vs multifield inflation would make a difference. In both cases you're introducing new field content and new interactions, but I'm not sure I'd describe either as governed by different laws? $\endgroup$ – Eletie Dec 22 '20 at 13:35
  • $\begingroup$ No. The laws of physics remain the same for all fields. The fields may have different potentials and therefore roll/evolve/decay differently. $\endgroup$ – astronat Jan 9 at 22:54

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