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dan-ros
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24 votes
2 answers
4k views

Why are protons and neutrons the "right" degrees of freedom of nuclei?

12 votes
1 answer
3k views

Peskin Schroeder $\phi^4$ mass renormalization

9 votes
2 answers
2k views

Why is $SU(3)$ chosen as the gauge group in QCD?

9 votes
2 answers
933 views

Why does the Walecka model not include pions?

8 votes
4 answers
671 views

Why don't we call the fermions in the standard model force carriers?

6 votes
0 answers
842 views

Why do tadpoles contribute to amplitudes?

6 votes
1 answer
780 views

Why do we have to choose a gauge to quantize a gauge theory?

5 votes
0 answers
147 views

Why are interactions always mediated via bosons (as opposed to fermions)? [duplicate]

5 votes
1 answer
7k views

What exactly means "is a singlet under $SU(N)$" [duplicate]

5 votes
1 answer
2k views

Matsubara frequencies as poles of distribution function

4 votes
1 answer
164 views

Is there an action for every physical law?

4 votes
0 answers
83 views

Lagrangian of classical electromagnetism without $A_{\mu}$ field [duplicate]

4 votes
2 answers
1k views

Where is the BRST symmetry?

4 votes
0 answers
318 views

Why is QCD hard to solve if I know the beta functions?

4 votes
0 answers
111 views

Can two closed strings in string theory be tangled?

4 votes
3 answers
587 views

If space and time are equivalent, what's Spin in time dimension

4 votes
2 answers
1k views

System in mechanical but not thermal equilibrium

4 votes
0 answers
80 views

Relation between mean field critical point and RG critical point

3 votes
1 answer
522 views

Why are RG flow fixed points associated with different phases?

3 votes
1 answer
234 views

Why are infinitesimal shifts sufficient to prove that a symmetry holds?

3 votes
1 answer
104 views

Bose-Einstein-statistics out of fermionic many body system

3 votes
0 answers
360 views

Measure energy state of quantum harmonic oscillator

3 votes
1 answer
1k views

Intuitive reason why bound states correspond to poles

3 votes
1 answer
607 views

How are scale of renormalization and scale of symmetry breaking related?

3 votes
1 answer
496 views

How to calculate conductivity / electron mobility from theory?

2 votes
1 answer
206 views

Could there be a pseudovector kinetic term for fermions?

2 votes
0 answers
110 views

LSZ formula in spontaneously broken gauge symmetry

2 votes
2 answers
190 views

What happens at the exact moment an electron absorbs a photon

2 votes
1 answer
87 views

Why does nuclear matter tend to maximize pressure?

1 vote
1 answer
324 views

Phonon-phonon-interaction as higher order terms in the potential