Recent content by centry57

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    Graduate Are there any other quantum field theory videos available?

    There is a video from Harvard
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    Graduate Is a symmetric Lagrangian leads to a symmetric Stress-Energy Momentum？

    I was adoubt if a symmetric stress-energy tensor 's lagrangian is symmetry . Since {\cal L}= - \frac{1}{16\pi}F^{\mu\nu} F_{\mu\nu} is symmetry on \mu &\nu,the corresponding Stress-Energy Tensor \Theta^{\mu}\,_{\nu} = - \frac{1}{4 \pi} F^{\mu \alpha} \partial_{\nu}A_{\alpha} +...
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    Graduate Is a symmetric Lagrangian leads to a symmetric Stress-Energy Momentum？

    Is a symmetric Lagrangian leads to a symmetric Stress-Energy Momentum ？
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    Graduate What is the Classical Connection to QM Spin?

    can anyone send the paper “F.J. Belinfante，On the spin angular momentum of mesons” to my Email：centry57@gmail.com and HC Ohanian‘s “What is spin?”
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    Graduate Make sure the Lagrangian symmetry？

    I mean if the Stress-energy momentum has the form T_{\mu\nu}=T_{\nu\mu}
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    Graduate Make sure the Lagrangian symmetry？

    Is the Lagrangian of the neutral Proca field \mathcal{L}=-\frac{1}{16\pi}\left(F^{\mu\nu}F_{\mu\nu}-2m^2 A_{\mu} A^{\mu}\right) symmetric? And How to make sure whether it's symmetric.
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    Undergrad What is the limit of (x/x+1)^x as x tends to infinity?

    \lim_{x\rightarrow \infty} (x/x+1)^x= \lim _{x\rightarrow \infty} (1+\frac{-1}{x+1})^{-(x+1)\frac{x}{-(x+1)}})=\lim_{x\rightarrow \infty} e^\frac{x}{-(x+1)}}=e^{-1}
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    Graduate Understanding Dirac Delta Squares: Clarifying Doubts

    Here are some more information：http://en.wikipedia.org/wiki/Dirac_delta_function
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    Graduate How to Derive Green's Function for the Laplacian in 3D?

    Here are some pages of Arfken's “Mathematical Methods for Physicists ” I don't How to work out the Green's function! Can anyone explain (9.174)and(9.175) for me ? I'm hoping for your help, Thank you !