Reactionless propulsion still implausible: news at 11https://twitter.com/arstechnica/status/801190566780354560 …
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Replying to @Reedbeta
Maybe it's bc I'm a physics buff, but it's disconcerting to see how many usually-smart people are uncritically claiming "the EM drive works"
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Replying to @Reedbeta
Yeah. "But maybe conservation of linear momentum isn't..." - stop right there, read up on Noether's theorem!
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Perhaps the drive works without violating conservation of momentum by tugging on distant objects.
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After all, quantum fields can transmit forces between distant objects in many other ways.
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Replying to @TimSweeneyEpic @rygorous
Such as by...emitting particles. Which carry away the momentum.
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Actual particles, yes. But mass distribution of a quantum field is unknown, as is momentum carrying ability.
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Replying to @TimSweeneyEpic @rygorous
No, quantum fields don't mysteriously propagate mass or momentum over long distances absent detectable particles.
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So, do nearby magnets exchange actual photons? Have you seen them? What color are they?
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Replying to @TimSweeneyEpic @rygorous
When an EM field _accelerates_ a charged particle there are actual photons emitted, yes (synchrotron radiation)
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Off the top of my head haven't heard about the neutral magnet vs magnet case, but would expect radiation there too
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