PeterDonis's latest activity
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PeterDonis replied to the thread High School Infinite universe, infinite volume from the beginning?.Thread closed for moderation. -
PeterDonis replied to the thread Undergrad Another Time Dilation Question.No, neither of these are forces in relativity. They are effects of choosing a non-inertial frame. The key property that makes them not... -
PeterDonis reacted to PeroK's post in the thread High School Trivial quantum entanglement question (from a rookie) with
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You have several misconceptions about entanglement. First, entanglement is often a result of conservation laws and any number of... -
PeterDonis replied to the thread High School Needs explanation for P in quantum tunneling formula.The OP question has been answered, and this thread is closed. @DanteKennedy we've established that whatever sources you have used to... -
PeterDonis replied to the thread High School Needs explanation for P in quantum tunneling formula.This is not correct. Quantum tunneling does not involve decoherence or measurement. Yes, it is. See above. -
PeterDonis replied to the thread High School Needs explanation for P in quantum tunneling formula.I'm not aware of any such relationship. Why do you think there is one? -
PeterDonis replied to the thread Undergrad Another Time Dilation Question.Sure he can, just not at rest in a single inertial frame. But he can consider himself to be at rest in a non-inertial frame. -
PeterDonis replied to the thread Undergrad Another Time Dilation Question.And for one more comment if we need it, you're contradicting what you yourself posted in post #7 of this thread--where you made the same... -
PeterDonis replied to the thread Undergrad Another Time Dilation Question.Note, btw, that this is also not a direct observation; it's a calculation. For what gets directly observed, look up Penrose-Terrell... -
PeterDonis replied to the thread Undergrad Another Time Dilation Question.Please read post #24 again. It explicitly uses the term "length contraction", and claims that this explains the shorter travel time by... -
PeterDonis replied to the thread Undergrad Another Time Dilation Question.Not if he's going to say that the Earth-star distance is length contracted to a few light-months. That claim requires him to be using an... -
PeterDonis replied to the thread Undergrad Another Time Dilation Question.Not on this view, he doesn't. On this view, he's at rest the whole time. See my post #26 just now. -
PeterDonis replied to the thread Undergrad Another Time Dilation Question.This is only part of the picture. First, in order to apply length contraction to the Earth-star distance, as you are doing, we have to... -
PeterDonis replied to the thread Undergrad KE of rotating disc.So ##M / \pi R^2## is the areal density. I see. -
PeterDonis replied to the thread Undergrad KE of rotating disc.You can't. You don't get to freely choose how the area element works. That's already chosen for you by the fact that you're using polar...