PeterDonis's latest activity

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...

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...

Yes, it assumes that the only source of uncertainty is that inherent in the quantum wave function. That's the argument I understood the...

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

And this invalidates the rest of your reasoning regarding ##\Delta p## being infinite. The correct conclusion from ##\langle H \rangle =...

No. The geodesic is a worldline. The 4-momentum is a 4-vector ##k^\mu## that is tangent to that worldline. And... No, this is not...

Since we are talking about relativity, the term "photon" is out of place; that's a quantum term. A better term might be "light pulse" or...

How are you obtaining these statements? Please show your work.

If the potential in the box walls has only a finite width, yes.

By analogy, "homogeneity of time" would mean invariance under time translations. And "homogeneity of space and time", which is what...

What source? Again, please give a specific reference. I'm not sure there's actually a difference, but without seeing the actual other...

Btw, I personally would argue that the statement I just quoted above, all by itself, is sufficient to establish that we must have ##ds =...

Ok, so their ##ds## and ##ds'## are describing the same infinitesimal spacetime interval in flat spacetime, just in two different...

A. Einstein. "The Foundation of the General Theory of Relativity". Annalen der Physik 354 (7), 769-822. (Translated version at...

Which book? Where? Please give a specific book/chapter/section/page reference.