PeterDonis's latest activity
-
PeterDonis reacted to JimWhoKnew's post in the thread B Trying to calculate proper time of worldlines using rotating frames with
Like.
As @PeterDonis said in #22, the OP calculated in the Born coordinates (see the "edit" note at the end of #20). I just "tidied up" the... -
PeterDonis replied to the thread I Question about discussions around quantum interpretations.Oh, for goodness' sake. I'm sorry to sound blunt here, but if you feel cheated because you didn't think to look at the inside cover of...
-
PeterDonis replied to the thread I Schrödinger equation and classical wave equation.I'm not sure what you're asking for in post #8. That might help here, yes. The Schrodinger Equation is (writing it in one spatial...
-
PeterDonis replied to the thread B Trying to calculate proper time of worldlines using rotating frames.I'm not sure the OP is actually using the same Born coordinates for both observers. The calculation in post #7 looks like it's...
-
PeterDonis reacted to Dale's post in the thread I Is Maxwell's electromagnetism an effective (field) theory? with Like.
Unfortunately, that means the topic is not suitable for this forum. We exclusively focus on topics that are in the literature. We could...
-
PeterDonis replied to the thread I Question about discussions around quantum interpretations.Why would that be a reason not to read it? Even if it wasn't written by Feynman, strictly speaking, it's still about him, and has a lot...
-
PeterDonis replied to the thread B Need help understanding particle physics and quantum physics.What would count as such a measurement, if all the measurement results we already have that confirm the predictions of our best current...
-
PeterDonis replied to the thread B Trying to calculate proper time of worldlines using rotating frames.You are misinterpreting what that coordinate restriction means. The Born ##\phi## coordinate of the rotating observers the OP is using...
-
PeterDonis replied to the thread I Question about Parallel Transport.I think what you mean by "regular Euclidean space" here is actually "Newtonian physics". Basically you're saying that in Newtonian...
-
PeterDonis replied to the thread I Question about Parallel Transport.Ok, so it's not a matter of the analogue to F-W transport not existing in Riemannian manifolds, it's a matter of whether it's considered...
-
PeterDonis reacted to Orodruin's post in the thread B Matter density right after the decoupling with Like.
Free-streaming means that the (average) density of matter is so small that the mean-free path exceeds the size of the Universe. The...
-
PeterDonis replied to the thread A three month long summer vacation from public school seems stupid.I agree that both alternative views should be presented, or neither. This being GD, I think it's ok to opt for "both" at least for a...
-
PeterDonis replied to the thread A three month long summer vacation from public school seems stupid.I don't think this is true. US corporations can increase their profits by investing in poorer countries to make them richer. But doing...
-
PeterDonis replied to the thread B Trying to calculate proper time of worldlines using rotating frames.The OP already did that. @JimWhoKnew was just checking to see that the answer the OP got in the rotating frame is consistent with the...
-
PeterDonis replied to the thread B Trying to calculate proper time of worldlines using rotating frames.Unfortunately PF doesn't have a way to automatically insert LaTeX tags or delimiters.