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Sven2009
  • Member for 5 years, 2 months
  • Last seen more than a month ago
8 votes
3 answers
446 views

How to compute gauge potential $A$ from the field strength $F$?

5 votes
1 answer
524 views

Feynman propagator in curved spacetime?

5 votes
1 answer
326 views

Confusions on QED renormalization

5 votes
1 answer
266 views

Confusion on theorem 8.1.2 and corollary in Wald's GR book

4 votes
2 answers
431 views

Variation of Pontryagin density $*R^{abcd}R_{abcd}$ with inverse metric $g^{ab}$

4 votes
2 answers
460 views

Usage of the cutoff momentum in QFT integral

4 votes
1 answer
528 views

Confusions on $U(1)_{A}$ problem

4 votes
1 answer
169 views

Regularization of functional determinant over an Instanton background

3 votes
1 answer
131 views

Gauge fixing and instanton calculation

3 votes
1 answer
174 views

Is Yang-Mills Instanton number zero?

3 votes
1 answer
296 views

Stability and topological charge of kink (anti-kink) solutions (soliton)

3 votes
0 answers
117 views

Confusions on symmetry breaking and classical field theory

3 votes
1 answer
121 views

Calculations of chiral condensate (from David Tong's notes)

3 votes
1 answer
184 views

Regularization of $\delta$ function and Chiral anomaly in gravity

3 votes
2 answers
192 views

Transition amplitude, $\langle f|i\rangle$ or $\langle f|S|i\rangle$?

2 votes
1 answer
371 views

Confusion on $S$-Matrix and scattering amplitude in Matthew Schwartz's QFT textbook

2 votes
1 answer
207 views

Confusion on wave packet and creation operator in Mark Srednicki's book

2 votes
1 answer
232 views

In path-integral, when do we have to insert fact $i$ in front of the action $S$ in the exponent?

2 votes
0 answers
118 views

Confusions on effective action and 1PI 3-point Green's function [duplicate]

2 votes
1 answer
140 views

Confusions on expectation value for $\hbar$ going to zero

2 votes
3 answers
385 views

Confusion about conserved current in quantum field theory

2 votes
0 answers
255 views

Confusion about chiral anomaly (Fujikawa's method)

1 vote
1 answer
213 views

Removable singularity of metric?

1 vote
0 answers
50 views

Non-vanishing vacuum expectation value and Non-unique vacuum state in symmetry breaking

1 vote
1 answer
194 views

Boundary condition of gauge field for finite Euclidean action

1 vote
1 answer
108 views

Confution on UV cut-off in the calculation of effective action and Beta function

1 vote
1 answer
302 views

Quark condensate and spontaneous symmetry breaking?

1 vote
0 answers
112 views

Commutators of covariant derivative and Yang-Mills Field Strength in curved spacetime

1 vote
0 answers
60 views

Confusion on Triangle Diagram and contact terms (from Mark Srednicki' book)

1 vote
0 answers
97 views

In the derivation of LSZ formula, why do we need $\langle k| \phi(0)|0 \rangle =1$? (Srednicki's book)