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38 votes
2 answers
5k views

Large and small gauge transformations?

24 votes
2 answers
5k views

In what sense is the renormalization group equation a group?

21 votes
4 answers
4k views

$\mathrm{SU(3)}$ decomposition of $\mathbf{3} \otimes \mathbf{\bar{3}} = \mathbf{8} \oplus \mathbf{1}$?

17 votes
1 answer
4k views

Green's function in path integral approach (QFT)

14 votes
1 answer
2k views

Are "confinement" and "asymptotic freedom" two sides of the same coin?

12 votes
0 answers
1k views

How do we know for sure a theory is non-renormalizable?

12 votes
2 answers
1k views

Could spontaneous symmetry breaking happen again in our universe?

11 votes
2 answers
5k views

Lorentz transformation of the Spinor Field

8 votes
3 answers
2k views

Hodge star operator on curvature?

8 votes
1 answer
2k views

Unitary Lorentz transformation on quantized Dirac spinor

8 votes
2 answers
2k views

QFT Dyson series: why are we solving the Schrodinger equation?

7 votes
1 answer
1k views

Question about the Noether charge algebra

7 votes
2 answers
613 views

What is the exact relation between $\mathrm{SU(3)}$ flavour symmetry and the Gell-Mann–Nishijima relation

6 votes
0 answers
553 views

How does the renormalization scale $\mu$ cancel in all finite observables?

6 votes
2 answers
1k views

How many physical degrees of freedom does the $\mathrm{SU(N)}$ Yang-Mills theory have?

6 votes
1 answer
304 views

Background Gauge Condition In Moduli Space

6 votes
1 answer
490 views

Proof that we can always find a gauge transformation such that $A_0=0$?

5 votes
1 answer
510 views

Question about the Killing form in Georgi

5 votes
1 answer
329 views

How do we measure the physical field of a particle?

5 votes
2 answers
297 views

Evaluate $1$-loop contribution to the $4$-point Green's function

5 votes
1 answer
722 views

Help in deriving the Adler-Bell-Jackiw anomaly

5 votes
3 answers
272 views

Is there a table that sums up the parameters, the assumptions/symmetries, and the predictions of the standard model?

5 votes
0 answers
216 views

Is there an algorithm to diagonalize a matrix using gauge transformations

4 votes
1 answer
945 views

Question on derivation of Ward identity

4 votes
2 answers
630 views

Why do we require manifolds to be a topological space?

3 votes
2 answers
959 views

Why do we require the generators of $\mathrm{SU(N)}$ gauge theories to be $N \times N$ matrices?

3 votes
3 answers
508 views

Naive question about the S-matrix

3 votes
0 answers
122 views

Why is general relativity considered to be a gauge theory? [duplicate]

3 votes
1 answer
430 views

Question about Weinberg's derivation of a one-particle states under the Poincare group

3 votes
1 answer
1k views

Trying to rhyme Peskin and Schroeder with Weinberg