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seen Oct 30 '13 at 4:00

Apr
9
awarded  Popular Question
Apr
21
accepted proper variation of action term
Apr
19
comment proper variation of action term
I guess I have a mistake further upstream. Your results seem to confirm that what I am asking of this first term is not possible... Thanks much!
Apr
19
comment proper variation of action term
Thank you! Well I'm familar w/ this so far. I asked poorly I suppose (trying to do a MWE), but I have a term $g^{ab}\,\partial_a\phi\,\partial_b\phi$ and I need to get it to $(1/\phi)\,\phi^{;c}\,\phi_{;c}$. Ugg. Its the Brans-Dicke term if that rings a bell. :)
Apr
19
revised proper variation of action term
really started off writing this up wrong!
Apr
19
revised proper variation of action term
clarify assumptions
Apr
19
asked proper variation of action term
Apr
15
comment Does quark color contribute to “spin degeneracy” for QGP calculations?
That is what I have eventually learned as well - thank you and I would gladly accept your answer if you submitted it.
Apr
14
revised Does quark color contribute to “spin degeneracy” for QGP calculations?
edited tags
Apr
14
asked Does quark color contribute to “spin degeneracy” for QGP calculations?
Apr
9
comment Pauli paramagnetism for electrons with external magnetic field
Anybody? Or is this too....?
Apr
8
revised Pauli paramagnetism for electrons with external magnetic field
less confusing title
Apr
8
asked Pauli paramagnetism for electrons with external magnetic field
Apr
8
accepted Difference between slanted indices on a tensor
Apr
7
awarded  Commentator
Apr
7
comment Difference between slanted indices on a tensor
Well I'm reading about solving a tensor equation by taking traces of it, there are 3, and they are listed as $C^a{}_{ab}$, $C^a{}_{ba}$, $C_{ba}{}^a$. They are distinct and so they are apparently different, but I don't know why... I guess the last 2 in particular. @ChrisWhite Thanks for the tip!
Apr
7
asked Difference between slanted indices on a tensor
Mar
30
accepted Photon on null geodesic
Mar
30
comment Photon on null geodesic
so does the 1st implied equation then imply that $(a^2\,\dot{x})\,\dot{x}$ is a conserved quantity? I know that $V_{\mu}\,U^{\mu}$ is conserved... Where did these two implied equations come from? The 2nd, doesn't it say that the quantity on the right is conserved along any of the three geodesics? But the first...?
Mar
28
asked Photon on null geodesic