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schris38
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13 votes
2 answers
1k views

Basic Facts about Lie Algebras

8 votes
1 answer
256 views

Why the Feynman diagrams contributing to the effective action $\Gamma[\phi_{\rm cl}]$ are stripped/amputated/have no external lines?

7 votes
3 answers
903 views

Local gauge transformations and Noether Current

6 votes
0 answers
153 views

Weinberg Vs Srednicki analysis for the electron self-energy

5 votes
1 answer
371 views

The Faddeev-Popov generating functional and its independence on the gauge-fixing function

5 votes
1 answer
123 views

Conserved charge at null infinity associated with Large gauge transformation

5 votes
1 answer
376 views

Renormalization conditions on $\phi^4$ theory

5 votes
1 answer
198 views

Virtual soft photon exponentiation

4 votes
1 answer
225 views

Symmetry implies Ward identity

4 votes
1 answer
177 views

Subleading soft theorem and gauge invariance

4 votes
1 answer
316 views

On the Ward Identity in QED

3 votes
1 answer
220 views

In and out states of scattering in Asymptotically flat spacetimes

3 votes
2 answers
308 views

Invariants of inner product in pseudoreal representation of $SU(2)$

3 votes
1 answer
245 views

Green Function expressed in terms of Hankel function (of the second kind)

3 votes
2 answers
515 views

BRST Symmetry and Single Particle States

3 votes
0 answers
113 views

Decomposition of the Photon Propagator into $K$ and $G$ propagators

3 votes
0 answers
237 views

Faddeev - Kulish paper questions

3 votes
1 answer
140 views

Question about field configurations on the boundary of $\mathcal{I}^+$

3 votes
0 answers
138 views

QED Soft Theorems and Momentum Conserving $\delta$ function

3 votes
1 answer
223 views

Propagator in Large Momentum Shell - Renormalization Group

3 votes
2 answers
440 views

Renormalization of the photon propagator at loop-level

3 votes
0 answers
85 views

Total Angular Momentum operator in spinor-helicity formalism

3 votes
0 answers
280 views

Understanding the factorization of subleading soft contributions-massless QED

3 votes
3 answers
308 views

Power emitted during thermal radiation

2 votes
1 answer
144 views

Schwinger and Hadamard functions derivation in Birrell's and Davies' book

2 votes
1 answer
120 views

Nambu-Goto action and the World-Sheet Area

2 votes
1 answer
81 views

Tensionless string in Nambu-Goto action

2 votes
0 answers
126 views

What is the current theoretical and experimental understanding of the mass of the photon? [duplicate]

2 votes
0 answers
62 views

Predicting a nonzero mass for the photon

2 votes
1 answer
323 views

Temperature of quantum fields and periodicity