PeterDonis's latest activity
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I agree. I don't think the OP does, though. -
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...
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PeterDonis replied to the thread Does it make sense to build new radio telescopes?.That's true. This at least makes it a bit clearer what you're concerned about. But first, this is just one particular area of science...
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PeterDonis replied to the thread Does it make sense to build new radio telescopes?.That's not science. That's technology. As far as I can tell, it doesn't even depend on any discoveries at or near the frontier of...
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PeterDonis replied to the thread Does it make sense to build new radio telescopes?.Oh, so you think it's only worth studying objects if they were created by alien civilizations? That doesn't make sense to me...
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PeterDonis replied to the thread B How can a black hole absorb matter?.Careful. The event horizon expands during this process. By the time the shell reaches ##R'##, the event horizon is also at ##R'##. That...
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PeterDonis replied to the thread Does it make sense to build new radio telescopes?.So you think advancing science is stupid? Neither does understanding "the structure of the Universe", or indeed much scientific...
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This is too broad of a statement. The correct statement would be that in Schwarzschild coordinates the coordinate time asymptotically...
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A surface with at least one null tangent vector everywhere on it. Light cones are another example. In flat spacetime, at any instant...
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This is not correct. "Time slows down as you approach a black hole" is an over-simplification. Things can fall into a black hole in...
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PeterDonis reacted to JimWhoKnew's post in the thread I Visual depiction of atomic orbitals with
Like.
Divide your result corresponding to ##p_y## by ##i## (a global phase factor) and observe that now both expressions are real (and... -
PeterDonis replied to the thread I How do Tensors "work" in relation to linear algebraic objects?.That's not what I said. Read my post again. That's not what I said either.