PeterDonis's latest activity
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PeterDonis replied to the thread B Trying to calculate proper time of worldlines using rotating frames.Look up Born Coordinates. -
PeterDonis replied to the thread B Is a table levitating possible, even at a minuscule probability?.I think you're confused. See below. What does that even mean? Physics doesn't work by "imagining" things. You can't. There's just one...
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PeterDonis replied to the thread B Is a table levitating possible, even at a minuscule probability?.I don't know where you're getting this from either. See my post #28 just now; the fact I stated there contradicts what you're claiming...
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PeterDonis replied to the thread B Is a table levitating possible, even at a minuscule probability?.I don't know what you're basing this on. In any deterministic theory, the number of trajectories and the number of initial states are...
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PeterDonis replied to the thread B Is a table levitating possible, even at a minuscule probability?.We don't, because we don't know the exact state of the universe, and the knowledge we do have is not sufficient to rule out any...
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PeterDonis replied to the thread I Energy*time uncertainty for particle decay.Depends on what you mean. The de Broglie formula still appears in heuristic discussions of momentum in quantum mechanics (see, for...
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PeterDonis replied to the thread B Is a table levitating possible, even at a minuscule probability?.If that's what he's trying to claim, he's wrong. See my post #22 just now.
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PeterDonis replied to the thread B Is a table levitating possible, even at a minuscule probability?.You don't need gravity to turn itself off for an extremely, extremely, extremely improbable set of conditions to make the table...
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PeterDonis replied to the thread B Is a table levitating possible, even at a minuscule probability?.I don't know where you're getting this from. Classical mechanics says that the motion is deterrmined by the initial conditions and the...
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PeterDonis replied to the thread B Is a table levitating possible, even at a minuscule probability?.They're the same thing. "Statistical mechanics", at least if we're talking about classical physics, is derived from "the deterministic...
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PeterDonis replied to the thread I Is there a bad intuition or bad explanation in quantum entanglement?.I don't see why they would. My understanding is that non-relativistic QM is the non-relativistic limit of standard relativistic QFT. My...
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PeterDonis replied to the thread I Energy*time uncertainty for particle decay.That's not a question that really makes sense. Suppose I asked you to give me an example of the basics of arithmetic. What would you...
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PeterDonis replied to the thread A Dirac's integral for the energy-momentum of the gravitational field.MTW is a heavy lift (both figuratively and literally--it's the heaviest textbook by poundage that I've ever owned :wink:), but it is of...
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PeterDonis replied to the thread B Is a table levitating possible, even at a minuscule probability?.Classical mechanics doesn't say a table levitating is impossible, just extremely, extremely, extremely improbable. A classical model...
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PeterDonis replied to the thread A Dirac's integral for the energy-momentum of the gravitational field.I think what he's trying to say is that, within certain limits (basically staying within the special class of coordinate charts he's...