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Originally Posted by Taibak
Why should gravity stop just because you've taken something apart? Put another way, general relativity says that it should be possible for two neutrons to orbit a common center of mass in well-defined, completely predictable orbits. Quantum mechanics says that would violate uncertainty. Something has to give.
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Thanks for the info!
I don’t think I would say that “gravity stops” when things are taken apart. I’m thinking about something like a large electro-magnet that can overcome the pull of gravity by means of the pull of the magnetic field, and the magnet can hold a steel bar up in the air. Switch off the magnet, and the steel bar falls. With the magnet on, we are not doing away with the gravity, we are just overpowering it with a strong magnetic field.
It’s like a piece of cellophane. I can’t throw it away. It sticks to my hand and doesn’t fall because of an electric field at my hand. At close range to my hand, the electric field is stronger than the gravity field at that same place.
The “completely predictable orbits” you mention, would that be in the total absence of the other fields? Could the presence of the other fields, on the small scale, break up the “predictability” of the orbits of the Neutrons? Can we totally isolate the two Neutrons from all other fields? In large-scale space in our solar system, we don’t have other fields that are strong on a large scale, and so the gravity field dominates the large-scale motion of the planets. But wouldn’t the other fields be stronger at short distances on the small scale?