PeterDonis's latest activity
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PeterDonis replied to the thread I Quantum behaviour of an electron around a positively charged sphere.This... ...has nothing to do with energy level transitions in atoms. An electron undergoing an energy level transition in an atom is... -
PeterDonis replied to the thread Does it make sense to build new radio telescopes?.It was gradual and not very clear-cut and took many decades to get to the position we're in now. It didn't happen overnight and it...
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PeterDonis reacted to Cerenkov's post in the thread Does it make sense to build new radio telescopes? with
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Why would you predicate your argument on such an average? Could you please explain your reasoning and how you arrive at the conclusion... -
PeterDonis replied to the thread Does it make sense to build new radio telescopes?.Why not? There's nothing impossible about it. Sure, it's not going to happen tomorrow. But what about a hundred years from now? Or a...
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PeterDonis replied to the thread I How do Tensors "work" in relation to linear algebraic objects?.You're missing the point: a tensor is not "expanding a vector into more dimensions". That's why mathematicians and physicists don't try...
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PeterDonis replied to the thread Does it make sense to build new radio telescopes?.At the present time, yes. But there could be lots of radio waves from previous ones. And the area of search isn't just our galaxy. It's...
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PeterDonis replied to the thread Does it make sense to build new radio telescopes?.They might not once they reach a certain point of advancement. But they still had to reach that point. And in doing so, judging by our...
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I have to say I don't really understand the point you're making. What you seem to be saying is that it is possible for an external...
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PeterDonis replied to the thread B How can a black hole absorb matter?.Please be clearer about what point relevant to the thread topic you are actually trying to make. So far I'm still not sure what it is.
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PeterDonis replied to the thread B How can a black hole absorb matter?.You could do that, I suppose, but why would you need to? Eddington-Finkelstein covers all the way out to ##r \to \infty##. Yes. What...
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I agree. I don't think the OP does, though.
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PeterDonis replied to the thread I Quantum behaviour of an electron around a positively charged sphere.What are you basing that claim on? Do you have a reference?
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PeterDonis replied to the thread B How can a black hole absorb matter?.Sure, at least three such charts have been known for decades and are well covered in the literature: Painleve, Eddington-Finkelstein...
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No. As I said, intuitive reasoning in curved spacetime is a mistake. Your objection turns out to be similar to claiming that you can't...
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PeterDonis replied to the thread B How can a black hole absorb matter?.Wrong. For someone falling into the black hole, time passes normally. Their clocks read one second per second, just as ours do. We see...