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OutrageousKangaroo
  • Member for 1 year, 2 months
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9 votes
0 answers
173 views

Deriving non-relativistic potentials from QFT

5 votes
0 answers
94 views

Analytic continuation of Feynman amplitudes seems ill-defined

4 votes
0 answers
65 views

Is the photon propagator always coupled to a conserved current?

3 votes
1 answer
54 views

Time dependency in the Hamiltonian in Schwartz's book on Quantum Field Theory

3 votes
0 answers
100 views

In and out states in QFT

3 votes
1 answer
131 views

Is gauge invariance necessary to have Ward identity hold for off-shell amplitudes?

2 votes
1 answer
204 views

Is the 1PI self-energy of a massive photon transverse? EDIT: Upsetting consequences for the photon mass and renormalizability

2 votes
1 answer
72 views

How can Chiral symmetry protect the mass of a fermion if it's broken by quantization?

1 vote
1 answer
76 views

Why can't spherical nuclei rotate?

1 vote
1 answer
96 views

Why are the poles of the propagator the masses of bound states and not the masses of unbound states as well?

1 vote
1 answer
145 views

Factor of 1/2 in the cross section of Møller scattering

1 vote
1 answer
82 views

Why can't the vector potential be seen as the wave function of a photon?

1 vote
1 answer
71 views

Symmetry protects against symmetry-breaking counterterms in renormalization

0 votes
0 answers
29 views

Evaluation of the OPE coefficients in Peskin&Schroeder's book