AndreasC said:
the way you determine those "physical grounds" makes no reference to GR
As I've already said, "energy gravitates" comes from GR. If that's not enough for you, we'll just have to disagree.
AndreasC said:
You said that the energy has to be "higher than the classical case" (which doesn't uniquely determine it anyways) because you can't have an eigenstate of both position and momentum
Yes. And that's all that's necessary for that claim. But that's not the only claim I was making.
AndreasC said:
and the wavefunction is a gaussian.
No. I mentioned that the wave function is a Gaussian simply to emphasize that that is consistent with my position. It is not the basis for my position.
AndreasC said:
none of that uniquely determines the Hamiltonian either
Again, I am not arguing that the Hamiltonian is a certain way on the basis of it being required by the wave function. That would be the tail wagging the dog. The wave function is determined by the Hamiltonian, not the other way around; and the fact that multiple possible Hamiltonians can determine the same wave function does not mean there cannot be
other arguments for preferring one Hamiltonian over the other.
AndreasC said:
Yes, within the framework of quantum mechanics,
No, within the framework of quantum mechanics
in the absence of gravity. The fact that we do not currently have a quantum theory of gravity does not mean you can just ignore gravity in contexts where it is relevant, such as this thread. You need to do the best you can at taking into account
both gravity (the fact that energy gravitates, per GR)
and quantum mechanics, given what we currently know. Adding arbitrary constants to the Hamiltonian
does not do that. It just ignores gravity, and you can't do that.
It seems to me that you basically want to ignore gravity when it suits you, while claiming that you agree that gravity matters. But you can't have it both ways. If gravity matters, which it does, then you can't just say "well, ordinary QM says we can add arbitrary constants to the Hamiltonian, so there". That simply is not a valid argument.
AndreasC said:
The main point of contention is that you have not offered a valid way to uniquely determine what that is.
I'm sorry, but this is simply false. You can be obstinate and say you continue to disagree with the way I have offered. But you can't say I haven't offered one. I don't see the point of continuing to repeat my arguments. If you disagree, well, then we disagree. But that's not the same as me not providing an argument at all.
Again, the rest of your post just repeats points that I've already responded to. I doubt I can add anything more to what I've already said, and I'm not going to respond to further posts from you that just repeat the same things. If you have any
new issues to raise, I'll respond to those.