Orodruin's latest activity
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Orodruin replied to the thread I Parallel transport.The Levi-Civita connection is the unique metric compatible and torsion free connection on a Riemannian manifold (or pseudo-Riemannian)... -
Orodruin replied to the thread I Parallel transport.Parallel transport is perfectly well defined along non-geodesic curves. The manifold described in the video is a Riemannian manifold so...
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Orodruin replied to the thread I Parallel transport.No, definitely not. There should be no outside reference. If he walks straight forward, he keeps the arrow in the same direction...
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Orodruin replied to the thread Errors and significant figures.This is only correct if you view ##\Delta L## and ##\Delta B## as fixed numbers. In a setting where you have estimated errors, it is...
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Orodruin replied to the thread I Follow-up on the Expanding Universe Insight article.They are the same to the ordered considered in the ##\simeq## relation.
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Orodruin reacted to Dale's post in the thread What should I do if I found a paper with same result as mine? with
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They will. Does your paper provide something that the first one does not? If so, you should cite the first paper in your introduction... -
Orodruin replied to the thread Tension in a string connecting two blocks having equal and opposite velocities.The problem statement also states different masses with the same velocity. So we have to go with that? But those two are incompatible...
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Orodruin replied to the thread Tension in a string connecting two blocks having equal and opposite velocities.Of course they can, but not at all times.
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Orodruin replied to the thread A Decomposition into irreps of compact Lie group.I think I found my issue. I was trying ##\sin^2(\theta)##, but when mapping from SU(2) to SO(3), the ##t## here is actually...
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Orodruin posted the thread A Decomposition into irreps of compact Lie group in Linear and Abstract Algebra.When decomposing a representation ##\rho## of a finite group ##G## into irreducible representations, we can find the number of times the...
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Orodruin replied to the thread B Newton's first law?.For things moving free or at rest, Observe what the first law does best. It defines a key frame, Inertial by name, Where the second law...
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Orodruin reacted to PeterDonis's post in the thread A A global energy conservation law in general relativity with Like.
You should resist the temptation. All you have done is rediscover the Komar energy. Which is a perfectly good integral conserved...
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Orodruin replied to the thread I How to calculate basis vectors from metric tensor (as a matrix)?.You’ve gotten things wrong. The basis is a choice. The typical coordinate basis depends only on the coordinates chosen - the manifold...
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Orodruin replied to the thread Can a dipole be modeled as a point charge?.Your post seemed to indicate otherwise …
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Orodruin replied to the thread Can a dipole be modeled as a point charge?.This dependence is present also far away from the dipole.