PeterDonis's latest activity
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PeterDonis replied to the thread I How do non-diagonal indices of a metric allow for local flatness?.No, he doesn't. For example, if you transform to Rindler coordinates, the round trip speed of light is not always ##c## in those... -
PeterDonis reacted to Ibix's post in the thread I How do non-diagonal indices of a metric allow for local flatness? with
Like.
It means that the errors from treating a region of spacetime as Minkowski spacetime become small as you make the region smaller. That's... -
PeterDonis replied to the thread I How do non-diagonal indices of a metric allow for local flatness?.You keep ignoring the qualifier I put in bold in the quote above. It's crucial. It means you're getting fixated on the properties of a...
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PeterDonis replied to the thread My Introduction.Unfortunately, that's not what this site is for.
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PeterDonis reacted to Dale's post in the thread B What reference frame is used for the velocity v in the Lorentz transformation? with Like.
After a very brief discussion among the mentors, we will leave this thread closed. As @weirdoguy mentioned, we have shown how the math...
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PeterDonis replied to the thread B What reference frame is used for the velocity v in the Lorentz transformation?.Thread closed for moderation.
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PeterDonis replied to the thread I How do non-diagonal indices of a metric allow for local flatness?.No, that's not what it means. @Dale's explanation in post #11 is correct, and what he says is true when the Riemann curvature tensor is...
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PeterDonis reacted to Dale's post in the thread I How do non-diagonal indices of a metric allow for local flatness? with Like.
It means that at any event in spacetime there exists a set of coordinates where the Christoffel symbols all vanish as do their first...
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PeterDonis reacted to Dale's post in the thread B What reference frame is used for the velocity v in the Lorentz transformation? with Like.
Yes, I have, and they do not matter in the end. They are the standard questions that most students ask as distractions from the actual...
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PeterDonis reacted to Dale's post in the thread B What reference frame is used for the velocity v in the Lorentz transformation? with Like.
Not here. The place for questioning and doubting authoritative theories is the professional scientific literature. PhyscisForums is an...
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PeterDonis reacted to Dale's post in the thread B What reference frame is used for the velocity v in the Lorentz transformation? with Like.
Yes. That is correct. In fact it is one of the underlying assumptions of the Lorentz transform This is wrong. The fact that there is no...
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PeterDonis reacted to PeroK's post in the thread B What reference frame is used for the velocity v in the Lorentz transformation? with Like.
There are different levels of "doubt". Suppose you started learning pure mathematics and immediately didn't understand mathematical...
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PeterDonis replied to the thread A Self-gravitating systems and MOND.That's correct. And yet your post #8 does exactly that, as you confirm in your post #10. Therefore, this thread will remain closed.
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PeterDonis replied to the thread B What reference frame is used for the velocity v in the Lorentz transformation?.That's correct. That's wrong. The ##v## in the Lorentz transformation is the relative velocity between the two frames.
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PeterDonis replied to the thread I Modern View of Quantum Phenomena.I see what you're saying. I just don't agree with it. I'll bow out at this point.