PeterDonis's latest activity
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I upvoted this, because I didn't realize it before. This raised the question for me, what we actually measure in spin measurement, if... -
PeterDonis replied to the thread I Modern View of Quantum Phenomena.That's not the assumption I'm questioning. The assumption I'm questioning is that "the relativity principle" is the same for Galilean...
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PeterDonis replied to the thread B What reference frame is used for the velocity v in the Lorentz transformation?.Actually, no, it doesn't. The computation is very simple. If we have a "hovering" observer at radius ##r## in Schwarzschild spacetime...
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PeterDonis reacted to pervect's post in the thread B What reference frame is used for the velocity v in the Lorentz transformation? with
Like.
Because to OP is talking about "reference frames", they are most likely doing Newtonian physics and not actually doing GR. If they... -
PeterDonis replied to the thread I Modern View of Quantum Phenomena.As a principle declared by fiat. Again, all those other references aren't making the foundational argument that you and your coauthors...
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PeterDonis replied to the thread I Modern View of Quantum Phenomena.Your use, yes. That was my point. All those other referees, reviewers, and audience members didn't publish those papers and books. You...
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PeterDonis replied to the thread I Modern View of Quantum Phenomena.Yes. Only once you've chosen a specific frame. As I've said, there is no invariant way to separate boosts and rotations. The K and J...
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PeterDonis replied to the thread I Modern View of Quantum Phenomena.It's the version you're using in your foundational argument. The sources you cite aren't making that kind of argument; they're just...
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PeterDonis replied to the thread I Modern View of Quantum Phenomena.I'm saying that if the transformations don't form a group, IMO it's highly questionable, to say the least, to use them in any kind of...
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PeterDonis replied to the thread I Modern View of Quantum Phenomena.No, they don't. They're not a group in 3+1 spacetime; they're not closed under composition. Only in 1+1 spacetime do Lorentz boosts by...
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PeterDonis replied to the thread I Modern View of Quantum Phenomena.But the Lorentz boosts cannot be invariantly separated from the spatial rotations. So it's the entire Lorentz group that's different...
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You failed to clearly communicate your algorithm. You only needed to code your algorithm, run it, and prove it once. It would then have...
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PeterDonis reacted to Nugatory's post in the thread I How do non-diagonal indices of a metric allow for local flatness? with Like.
Minkowski spacetime and Minkowski coordinates are different things. The spacetime is what it is no matter what coordinates we use to...
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PeterDonis replied to the thread I Modern View of Quantum Phenomena.No, I'm not. I'm pointing out that "the relativity principle", as far as physics is concerned, is not one thing. Galilean invariance is...
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PeterDonis replied to the thread New Idea for Prime Number Sieve.Thread closed.