@sonhouse
No idea, however, it reminded me of a spinning fridge. If you could spin your food at 99.95% light speed, its time would slow down so much that a sandwich would stay warm n fresh for a year.
@sonhouse saidI'm sure those minor details could be ironed out in no time.
@bunnyknight
Be hard to open though😉
@sonhouse
So if you have a disk spinning so that the edge is going at 99.9999% lightspeed, how would the huge time differential affect the overall molecular structure? Or would it affect gravity?
@bunnyknight
Well first off, it would have been torn apart before it reached a hundred thousand RPM but other than that pesky detail......
@sonhouse saidThat's obvious. But let's assume it's strong enough not to tear apart.
@bunnyknight
Well first off, it would have been torn apart before it reached a hundred thousand RPM but other than that pesky detail......
@sonhouse saidIt is explained in the article... you measure the variation in spedd in relation to a force which exerts torque which in turn slows down the particle. And they talk about 300*10^9 rpm you can do such rotational speed only for very small particles.
https://phys.org/news/2020-01-sensitive-torque-device-built.html
Any idea just how these things work?
The values are of course exciting.
@bunnyknight saidThe circumference of the disc would undergo length contraction. Since the interior is spinning at a lower rate and is stationary at the centre the disc would be compressed - assuming that we've somehow switched off the absolutely monstrous centrifugal forces. If it's massive then you'd get frame dragging effects. It's a little difficult to say as the situation is unphysical due to the requirement that it doesn't fly apart easily.
@sonhouse
So if you have a disk spinning so that the edge is going at 99.9999% lightspeed, how would the huge time differential affect the overall molecular structure? Or would it affect gravity?
@deepthought saidMany thought experiments are impossible in today's real world, yet they can still be useful.
The circumference of the disc would undergo length contraction. Since the interior is spinning at a lower rate and is stationary at the centre the disc would be compressed - assuming that we've somehow switched off the absolutely monstrous centrifugal forces. If it's massive then you'd get frame dragging effects. It's a little difficult to say as the situation is unphysical due to the requirement that it doesn't fly apart easily.
So if this spinning disk shrinks via relativity, it should spin even faster, however, it's mass should also increase, thus negating the rotation speed. And what effect would it have on the space-time fabric? I wonder if anyone has thoroughly analyzed what would really happen in this scenario, perhaps with a simulation on a supercomputer.
@bunnyknight
Yes, spinning neutron stars for instance. Generating frame dragging which BTW was the subject of a 40 year long experiment culminating in a satellite that directly measured frame dragging right here in Earth orbit. It took that long for technology to catch up with the original thought experiment that ATT was thought to be not measurable but 40 years later it was shown to be a fact and the tiny frame dragging was actually measured in a sat.
It was called Gravity Probe B:
https://en.wikipedia.org/wiki/Gravity_Probe_B