PeterDonis's latest activity
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PeterDonis replied to the thread Graduate Struct parallels between curvature behavior/abstract geometric cycles?.I would say the latter. The last paragraph of my post #9 explains why. -
PeterDonis replied to the thread Graduate Struct parallels between curvature behavior/abstract geometric cycles?.Can you give specific examples? Your own answers in post #7 say that, at least for singularity formation, this is not the case for the...
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PeterDonis replied to the thread Graduate Struct parallels between curvature behavior/abstract geometric cycles?.One note about this: your usage of the term "original coordinate patch" here assumes that it was a particular one that only covers a...
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PeterDonis replied to the thread Graduate Struct parallels between curvature behavior/abstract geometric cycles?.From what I know of the literature, the presentations in MTW and Wald are fairly representative. So I would say that your answers for...
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PeterDonis replied to the thread Graduate Struct parallels between curvature behavior/abstract geometric cycles?.Your rephrasings all look fine to me. You referenced MTW and Wald, both of which are classic works that treat this subject (and you...
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PeterDonis reacted to Demystifier's post in the thread Graduate Super fluids and superconductors at the molecular level with
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The conducting electrons interact with lattice atoms. It turns out that the lowest energy state of such interactions realizes when... -
PeterDonis replied to the thread Graduate Struct parallels between curvature behavior/abstract geometric cycles?.Thanks, this is very helpful. Some comments below. Your bolded text here appears to imply a causal relationship, but there isn't one...
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PeterDonis replied to the thread Graduate Struct parallels between curvature behavior/abstract geometric cycles?.Please give specific references. It's not clear from your description what actual physics this "sequence" is referring to.
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Consider the outer portion of the disk. For each ##n##, consider the annulus with inner radius ##r_n = R(\frac {n-1}n)##. The mass of...
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There is one more way to look at the problem, to avoid the continuum distribution of matter in the radial direction. Consider ##N##...
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We have two limits here. The first is the limit involved in the definite integral of a continuous mass distribution across a disk. We...
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Do you mean a hoop with zero or non-zero extension in the radial direction? In the case of a realistic non-zero extension, it's not...
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PeterDonis replied to the thread Graduate Rotating Disk Method to Attain Light Speed?.Um, yes, you are: This is challenging the established theory--just with nothing to back the challenge up but vague generalities...
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PeterDonis reacted to FactChecker's post in the thread Graduate Rotating Disk Method to Attain Light Speed? with Like.
Particles have been accelerated to near the speed of light, so it is known how much energy and force is needed. The results agree with...
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PeterDonis reacted to Ibix's post in the thread Graduate Rotating Disk Method to Attain Light Speed? with Like.
As Peter has pointed out, in this thread all you can do is apply the theory. You can call this "doing a thought experiment" if you like...