4 ms·
What's a known exception?
by unsupp0rted 3y ago
What's a known exception?
- perlgeek 3y agoThe Higgs Boson has spin 0. See https://en.wikipedia.org/wiki/Scalar_boson https://en.wikipedia.org/wiki/Scalar_boson
- bqmjjx0kac 3y agoI thought quantum mechanical spin is completely unrelated to Newtonian angular momentum, but IANAP.
- petsfed 3y agoIts not completely unrelated, but it is not clearly related. That is, spin contributes to overall angular momentum, but that contribution is much too large to be explained as the actual rotation of subatomic particles. So, like most quantum properties, our Newtonian intuitions are poor guides.
- truculent 3y agoIs using quantum mechanical spin a fair comparison? Isn't it moving the goalposts a bit? > As the name suggests, spin was originally conceived as the rotation of a particle around some axis. Historically orbital angular momentum related to particle orbits. While the names based on mechanical models have survived, the physical explanation has not. Quantization fundamentally alters the character of both spin and orbital angular momentum. > The classical analog for quantum spin is a circulation of energy or momentum-density in the particle wave field: "spin is essential a wave property". https://en.wikipedia.org/wiki/Spin_(physics) https://en.wikipedia.org/wiki/Spin_(physics)
- weberer 3y agoAny tidally locked satellite such as the moon.
- zmgsabst 3y agoA tidally locked satellite rotates: one rotation per orbit.
- this_was_posted 3y agounless the body it rotates around rotates at the exact same speed around another body in the opposite direction
- jacquesm 3y agoThen it still rotates.
- throwaway290 3y agoIt can only rotate relative to an arbitrary point, not in some objective absolute sense. Here it does not rotate relative to chosen point.
- jacquesm 3y agoSomething about privileged reference frames...
- throwaway290 3y agoBut what's the alternative, right?
- princevegeta89 3y agoA Pulsar, that's not really spinning but oscillating back and forth, becoming a very highly precise instrument of time measurement as well: https://physicsworld.com/a/pulsar-timekeepers-measure-up-to-atomic-clocks/ https://physicsworld.com/a/pulsar-timekeepers-measure-up-to-...
- ISL 3y agoPulsars are dense compact spinning objects. From your link: "Pulsars are neutron stars that rotate at very high speeds and appear to emit radio pulses at extremely regular intervals. The pulses are actually all we see of a radio beam that is focused by the star’s magnetic field and swept around like a lighthouse beacon."