All Questions
5
questions
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How can I calculate the square of Pauli-Lubanski vector in a rest frame?
recently I've been trying to demonstrate that, $$\textbf{W}^2 = -m^2\textbf{S}^2$$ in a rest frame, with $W_{\mu}$ defined as $$W_{\mu} = \dfrac{1}{2}\varepsilon_{\mu\alpha\beta\gamma}M^{\alpha\beta}p^...
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1
vote
1
answer
84
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Is the off-diagonal part of this rank-2 tensor integrand odd?
Peskin and Schroeder in Introduction to Quantum Field Theory consider the following tensor integral (Eq. 6.46):
$$\int \frac{\mathrm{d}^4l}{(2\pi)^4} \frac{l^\mu l^\nu}{D^n} = \int \frac{\mathrm{d}^4 ...
- 155
6
votes
1
answer
674
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The spinor metric, basic spinor calculations and spinor indices
I'm currently reading the textbook "Finite Quantum Electrodynamics" by Günter Scharf, but I find myself stuck already on page 24.
Background
Scharf introduces the index-raising symbol (spinor metric)...
- 144
2
votes
4
answers
1k
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Nature of Fields in QFT
I'm not exactly an expert in quantum physics, but this seems to be a simple question, and I can't find an answer anywhere!
There are specific types of fields used in physics: scalar fields (i.e. as ...
- 10.8k
3
votes
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answers
923
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The connection between classical and quantum spins
I have two questions, which are connected with each other.
The first question.
In a classical relativistic (SRT) case for one particle can be defined (in a reason of "antisymmetric" nature of ...
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