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Regarding neutrino masses: it's worth noting that Neil Turok et al. (https://arxiv.org/abs/1803.08930) have proposed a cosmological...

Epistemological :)

For a modern treatment of GR, differential geometry would provide the broader perspective. You can learn SR without much of that...

Technically, yes, this is possible. My understanding is that it's considered extremely unlikely, because whatever mechanism makes the...

To be fully technical, it is still possible that one of the neutrino mass eigenstates is 0. All we constrain with oscillation tests are...

No, they don't: Please don't post contradictory statements. Also, nonzero neutrino masses do not "suggest" that they do not travel at...

You just love taking tests that much? 😂

That's only correct for a free particle, i.e., zero potential. That's not the case in your example; you have a potential confining the...

It's right to be suspicious here since that's just the free Hamiltonian. Where did the "in a box" constraint go? Hint: boundary...

That's true. I haven't computed the actual deltas from the energy eigenstates the OP is using, but of course that could be done to see...

I fully agree with the rest of your post. My only concern was about the quoted part. But even purely in QM, the generalized uncertainty...

You can't argue anything from an uncertainty relation where one of the factors is zero. That breaks the math.

You can't use uncertainty relations to argue a single uncertainty will become small though? The uncertainty relation only gives a lower...

It's a bit loose. I would simply say: if space and time are homogeneous then we can conclude that ##a## in ##ds^2=ads'^2## does not...

You need only homogeneity to show that ##a## does not depend on coordinates. You use isotropy to show that ##a## can only depend on the...