anuttarasammyak's latest activity
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anuttarasammyak replied to the thread A Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?.Thank you @JimWhoKnew for the clear and easy-to-understand explanation for the "anomaly". I have preffered to regard "new"... -
anuttarasammyak replied to the thread A Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?.Thanks. Even with this general caution, may we take it obvious that in tensor division of $$ \bar{g}_{\mu\nu} := g_{\mu\nu}+\delta...
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anuttarasammyak replied to the thread A Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?.In the world of metric tensor undertaking variation where the metric tensor is $$ \bar{g}_{\mu\nu} := g_{\mu\nu}+\delta g_{\mu\nu} $$...
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anuttarasammyak replied to the thread A Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?.@haushofer it is a good chance to learn from your comments. May I say that in GR when tensor ##A_{abc..}^{def...}## is written...
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anuttarasammyak replied to the thread A Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?.@haushofer Thanks for the teaching. $$ g_{\mu\nu}+\delta g_{\mu\nu} =( g_{\alpha\nu}+\delta g_{\alpha\nu}) (g_{\mu\beta}+\delta...
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anuttarasammyak replied to the thread A Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?.No, I don't know any case in tensors. That is one of the reasons that I think : I am afraid that you are against it in post #11...
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anuttarasammyak replied to the thread A Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?.@haushofer The equation is the application of the rule for raising and lowering the indices in use of the (varied) metric tensor to the...
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anuttarasammyak replied to the thread A Is the variation of the metric ##\delta g_{\mu\nu}## a tensor?.Under variation of metric tensor, ##g_{\mu\nu}+\delta g_{\mu\nu} ## is a tensor but its parts ##g_{\mu\nu}## and ##\delta g_{\mu\nu} ##...
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anuttarasammyak replied to the thread A Reconciling units for the Einstein and Landau-Lifshitz pseudotensors.Why don't you start with the familiar case that all $$x^0,x^1,x^2,x^3$$ have dimension of length. All the metric tensor components, thus...
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anuttarasammyak reacted to Kostik's post in the thread A Dirac's integral for the energy-momentum of the gravitational field with
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@anuttarasammyak Excellent! This was hugely helpful. I wish Dirac had been a little less cryptic. It's not often that one consults... -
anuttarasammyak reacted to Kostik's post in the thread A Dirac's integral for the energy-momentum of the gravitational field with Like.
@anuttarasammyak Very helpful, thanks. I should have looked there, because Dirac's book takes a lot from LL. In my copy of LL, this...
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anuttarasammyak replied to the thread A Dirac's integral for the energy-momentum of the gravitational field.@Kostic As for your question the explanation of L-L : seems a good complementary to Dirac.
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anuttarasammyak replied to the thread Other Considering the change from CMP to AMO.I do not have academic background but I am involved in management of quantum computing research in a public institute. I observe most...
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anuttarasammyak replied to the thread B Average velocity as a weighted mean.Thanks @Ibix So in other words $$ \frac{1}{\bar{v}}=\sum_i \frac{r_i}{v_i} $$ where r_i is ratio of i-th segment's length to the whole...
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anuttarasammyak reacted to Ibix's post in the thread B Average velocity as a weighted mean with Like.
The parallel resistors formula comes from the continuity equation relating the input current ##I## to the currents ##I_i## through the...
