Confusions on effective action and 1PI 3-point Green's function
112398
Proof that the effective/proper action is the generating functional of one-particle-irreducible (1PI) correlation functions
156467
Does $\langle\Omega|\mathrm{e}^{\mathrm{i}Px}=\langle\Omega|\mathrm{e}^{\mathrm{i}0x}$? $(\langle\Omega| =$ ground state of the interacting theory)
91756
Degeneracy in one dimension
53800
Pure significance of line integrals of vector fields
105660
Invariance of action $\Rightarrow$ covariance of field equations?
101774
Three integrals in Peskin's Textbook
156636
The Existence of the $^1D$ term and the non-existence of the $^3D$ term?
17414
Lagrangian of an effective potential
86811
Help understanding a concept in multiple integrals
29152
Conversion of the Polyakov action into the Nambo-Goto action?
66919
When/why does the principle of least action plus boundary conditions not uniquely specify a path?
97800
Exterior power "commutes" with direct sum
148541
Quantization of a particle on a spherical surface
150395
Struggling to understand degenerate perturbation theory
29304
Surface integral of a scalar over a unit cube.
40837
Why $e^{i(π/3)} \ne -1$?
149910
interpreting triple integrals