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Raisins!!
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this post was submitted on 29 Sep 2024
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You are correct that the raisins would have other constraints to keep it from infitatly expanding into nothing. Not because it's not expanding but because it has external constraints like gravity keeping it there.
They do have expansion applied to them, but gravity and other things effecting space time would be keeping it on place.
As for attoms, I think you picture something solid. But there's not. The electrons are getting further from the nucleas, but it's still bound quantum mechanically to the attoms regardless of its position.
But then the nucleas isn't soldi either. It's made of smaller things yet, and so on and so forth. So inside would also be expanding. But again other forces at play would bind things together.
The expansion is also not a force. It can't overcome other forces so it keeps things in line.
Yes, atoms are made of smaller parts; electron orbitals change chemistry based on their distance from the nucleus, nucleons change the chances of emitting radiation based on their distance from each other, and quarks greating increase their mutual attraction based on distance.
The relative distance between fundamental particles is governed primarily by forces which don't seem to have changed much since nucleosynthesis. If expansion doesn't affect any of this, then saying things governed by forces are expanding is nonsensical.
I can see a perspective where time is slowing down, reducing the effective range of the forces and letting all matter shrink to fit the changing effective distance, and leaving unbound matter to appear to expand. However, I can't see how this would be meaningfully different from an expansion of all space, not how such a difference might be detected.
Regardless, the distances within atoms continue to behave consistently, while the distances within galactic superclusters do not.