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cdiamand | on: 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?
floatrock | parent | next
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.

ricksunny | root | parent | next
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?

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fooker | root | parent | next
"Flying saucers are closer than you think, and all my bitterness about academia"
BlueTemplar | root | parent
Huh, so Unidentified Flying Objects have been renamed to Unidentified Anomalous Phenomena...
sharpshadow | parent | next
“The fastest rotation achievable by standard motors is of the order of 10 kHz and a record of 667 kHz is reported for a millimetre-sized magnetically levitated sphere.”

From the spinning metal cylinder you can extract EM energy. It’s like a flywheel. The trick is how do you bring up the spin in the first place. The indication here is I guess that you can amplify the spin with EM waves.

“…depending on its rotation speed Ω compared to the field oscillation frequency ω, it can either absorb or amplify.”

m4rtink | parent | next
Definitely getting some giant magnetoresistence vibes - you know, that thing that (among other things) makes modern hard drives possible: https://en.m.wikipedia.org/wiki/Giant_magnetoresistance
thehappypm | parent | next
Perhaps in reverse (which should be equivalent, since Maxwells laws are time reversible).. rather than having waves amplified by stealing energy from the cylinder, waves could amplify the rotation of the cylinder.
Vox_Leone | parent | next
At first glance, the concept appears to serve as the basis for a 'portable' magnetic field generator, which could be installed on an interplanetary spacecraft.
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westurner | parent
ScholarlyArticle: "Amplification of electromagnetic fields by a rotating body" (2024) https://www.nature.com/articles/s41467-024-49689-w

> Could this be used as an engine of some kind?

What about helical polarization?

"Chiral Colloidal Molecules And Observation of The Propeller Effect" https://pmc.ncbi.nlm.nih.gov/articles/PMC3856768/

Sugar molecules are asymmetrical / handed, per 3blue1brown and Steve Mould. /? https://www.google.com/search?q=Sugar+molecules+are+asymmetr....

Is there a way to get to get the molecular propeller effect and thereby molecular locomotion, with molecules that contain sugar and a rotating field or a rotating molecule within a field?