jkb1603's user avatar
jkb1603's user avatar
jkb1603's user avatar
jkb1603
  • Member for 5 years, 4 months
  • Last seen more than a week ago
11 votes
Accepted

Does local mean infinitesimally small?

6 votes
Accepted

Trouble deriving expression for differential scattering cross section from $S$-matrix

5 votes
Accepted

How come $\frac{d}{dt}\left(\frac{\partial {r_i}}{\partial {q_j}}\right) = \frac{\partial {\dot r_i}}{\partial {q_j}}$ in Lagrangian mechanics?

4 votes

About the physical, measurable coupling constants, after renormalization

4 votes
Accepted

Do "tadpole diagram with two external legs" always vanish in massless theories?

3 votes

Replacing pole with delta function in Peskin and Schroeder

3 votes

How to use the Poisson Bracket to generate a finite Lorentz transformation?

2 votes
Accepted

Why is the creation operator of a particle in the conjugate field operator?

2 votes
Accepted

Intrinsic Curvature of a Cylinder

2 votes

Feynman rules out of the Lagrangian

2 votes
Accepted

Finding conjugate momentum of field in Dirac Lagrangian

2 votes
Accepted

Why the Feynman diagram with loops attached to external legs is irrelevant to the $T$-matrix?

2 votes
Accepted

$CP^N$ model in Peskin & Schroeder problem 13.3

2 votes
Accepted

One-loop diagram calculation: Wick rotation and gamma matrices

2 votes

Relationship between minima of scalar potential and mass of particles in the theory?

2 votes

Do the operators $\hat{P}^i=-i\partial^i, ~\hat{J}^{ij}=i(x^i\partial^j-x^j\partial^i),$ ever arise in QFT as momentum and angular momentum operators?

2 votes

$q^2=4m^2$ as the threshold for creation of a real electron-positron pair

2 votes
Accepted

Gauge invariance of loop Diagrams

2 votes

LSZ reduction formula for free fields

2 votes
Accepted

Collinear factorisation in QCD: why can we multiply probabilities?

2 votes
Accepted

Why Goldstein's book is claiming that radius and angle doesn't contain time variable even there is $\dot{r}$ and $\dot{\theta}$?

1 vote

Confusion on the renormalizability and the dimension of coupling constant (From Srednicki's book)

1 vote

On the normal ordering of Fermi fields

1 vote
Accepted

Commutators in Poincare algebra

1 vote

Schrödinger wavefunctional quantum-field eigenstates

1 vote

Deep inelastic and Bjorken limit

1 vote

Charge conjugation of fields

1 vote
Accepted

Relation between Short Wavelength Physics and Long Distance Physics

0 votes

How to derive operator form of the parton distribution function

0 votes

Fermion masses and $SU(2)$ symmetry