Recent content by neorich

Hi All, I'm working through the theory of the strong interaction and I roughly follow it. However I have some questions about the meaning of the terms. The book I use gives the gauge transformation as: \psi \rightarrow e^{i \lambda . a(x)} \psi First question ... What are the a(x)...

Thanks fzero, that was really helpful. Regards neorich

Dear All, I have inherited a few rotation matrices through some old computer code I am updating. The code is used to construct some geometry. The matrices I have inherited are left handed rotation matrices and they are being applied to a right handed coordinate system, but they give the...

Torquil, Thanks for your help, that was useful. neorich

Torquil, Thanks alot, So I follow the derivation of j^{\nu} ok. For the (dA)^2 term, I have added another step to see if I follow correctly, \frac{\partial(\partial_\alpha A^\alpha)^2}{\partial(\partial_\mu A_\nu)} = \frac{\partial(g^{\alpha\beta}\partial_\alpha...

Torquil, Thanks for your reply. So for the F^2, I should have upper indices, OK then, so the equation becomes: \partial_{\mu}(\partial^{\nu}A^{\mu}-\partial^{\mu}A^{\nu})-\frac{1}{\xi}g^{\mu\nu}\partial_{\mu}\partial_{\mu}A_{\nu}-j^{\nu}=0 Quote: "You also use mu too many places...

Hi All, I am trying to derive the equation of motion from a Lagrangian with a gauge fixing term, and I think get quite close to the result, but am missing some steps somewhere. These indices and notation is new to me, so please feel free to bring any mistakes to my attention. So the...

Thanks, The first link there was very helpful. Regards neorich

Dear Forum, It has been several days with no reply. Can you tell me if this is a difficult question? Is it a poorly understood area of physics? Or is it in the wrong area of the forum? Regards neorich

"Transistor Action" Dear Forum, I have a question about what is often referred to as "transistor action". I understand how a transistor operates within a circuit, and the characteristics of such a circuit, but I would like to learn physically how the bipolar transistor is able to control...

Thanks for your reply f95toli, very helpful. Regards neorich

Hi, Can someone please explain what Quench Management is particularly when applied to magnetism. Thanks Regards neorich

Good Morning, I have been carrying out some NMR relaxation measurements (T1 and T2), and have found that they have a dependence on the temperature of the sample, for example T1 is small at lower temperatures, and larger at higher temperatures. Can anyone explain why there is a dependence of...

Thanks lalbatros, It is interesting you talk about an oscillating entanglement behaviour, I had not really thought about this, only varying degrees of entanglement dependent on the conditions of the system, and (generally) decreasing with time. It certainly would be useful to have a...

Thanks for your reply, One of the examples given to explain an effect of entanglement is to do with the polarisations of two photons emitted from a source (travelling in opposite directions, although clearly this is just used to emphasize the point), and when you determine the polarisation...