PeterDonis's latest activity
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PeterDonis replied to the thread Undergrad I don't see how a black hole's event horizon can be crossed.In fairness, those are not a tool that would normally occur to someone not familiar with the subject. But they are a very useful tool, yes. -
PeterDonis replied to the thread Undergrad I don't see how a black hole's event horizon can be crossed.No, that's not the two spacetimes. Both of the things you describe are true in the same spacetime--the "eternal" black hole spacetime...
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PeterDonis reacted to Ibix's post in the thread Undergrad I don't see how a black hole's event horizon can be crossed with
Like.
The question you need to answer is what you want out of the discussion. If you want facts about black holes then almost any source is... -
PeterDonis replied to the thread Undergrad I don't see how a black hole's event horizon can be crossed.No, nobody has said that. What we have said is that what questions you can usefully ask will depend on what background you have, so you...
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PeterDonis reacted to Dale's post in the thread Undergrad I don't see how a black hole's event horizon can be crossed with Like.
It was. We are supposed to be an educational site. That is our stated goal and mission. I hope my colleagues here can look at your...
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PeterDonis reacted to PeroK's post in the thread Undergrad I don't see how a black hole's event horizon can be crossed with Like.
I admit haven't done a scientific analysis, but I think it's almost impossible to understand relativity without studying it from an...
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PeterDonis replied to the thread Undergrad Question about discussions around quantum interpretations.I don't see how this is a viable claim, since the screen does not exhibit any of the behaviors we exhibit as agents. I know this is the...
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PeterDonis replied to the thread A three month long summer vacation from public school seems stupid.And I learned a lot about how not to use high explosives from watching Wile E. Coyote and the Road Runner. :wink:
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PeterDonis reacted to weirdoguy's post in the thread A three month long summer vacation from public school seems stupid with Like.
No we wouldn't. It's basic psychology. No amount of wishfull thinking on your part will change the way humans, and in particular humans...
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PeterDonis reacted to DaveC426913's post in the thread Undergrad I don't see how a black hole's event horizon can be crossed with Like.
This is worth repeating, I think, so as not to discourage the OP: He may not be getting he answers he asks for, but it's not because...
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PeterDonis reacted to Ibix's post in the thread High School Project GRE^2AT - GR on Mt. Ranier with Like.
No. It's showing accumulated time of his clocks minus a lab clock (hence the vertical axis being "residual phase"). The comparison is...
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PeterDonis replied to the thread High School Project GRE^2AT - GR on Mt. Ranier.Yes: he was up there for "a full two days". Your result is ns/day, so you need to multiply by two. :wink:
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PeterDonis reacted to Dale's post in the thread Undergrad Variation of the lightning train thought experiment with Like.
Length contraction is the comparison of a length in a frame where it is at rest vs the length in a frame where it is not at rest. Light...
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PeterDonis replied to the thread Undergrad I don't see how a black hole's event horizon can be crossed.The correct premises are the black hole models that have been built using GR. Understanding them requires taking some time to learn...
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PeterDonis replied to the thread Undergrad I don't see how a black hole's event horizon can be crossed.I agree with this, but I think one also has to be realistic about just how much one has to learn--and unlearn.