Amplification of electromagnetic fields by a rotating body

Could this be used as an engine of some kind? The spinny thing giving off EM waves and those waves are caught by something like a solar sail?

No idea, but "amplification", "electromagnetic fields", "rotating bodies", and "published in Nature" are the keywords that get all the UAP podcasters drooling.

Get ready for an onslaught of "Physics behind flying saucers LEAKED" clickbait coming to a feed near you. Whether any of it is actually applicable doesn't matter, the clicks must flow.

I'm picking up a lot of projection in this reply;

• To know what keywords get UAP podcasters drooling, you must have watched your fair share of UAP podcasts.

• Your comment is the only one so far to make the association between the article's keywords & UAP, implying that you are yourself making the same association that someone interested in watching UAP podcasts would be making, in which case..:

• ...what is the difference between you and the would-be viewer of the next UAP podcast you are warning away?