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4 votes

2 answers

506 views

Please help me to understand calculation of the symmetry factor of Feynman diagrams (Lancaster & Blundell's Quantum field theory)

asked Sep 5, 2023 at 12:00

2 votes

1 answer

144 views

Schwartz's Quantum field theory (14.100)

asked Oct 19, 2023 at 2:57

2 votes

2 answers

518 views

Understanding the Griffith, Electrodynamics Example 8.2 (Net force on the northern hemisphere)

asked May 5, 2023 at 9:11

2 votes

0 answers

151 views

Is this formula, other than (2.38) in peskin's quantum field theory, also true?

asked Aug 23, 2023 at 12:42

2 votes

1 answer

89 views

Understanding Example 36.7 in the Blundell's Quantum field theory

asked Jan 24, 2023 at 8:33

1 vote

2 answers

157 views

Argument about identical particles

asked Jan 9, 2023 at 13:28

1 vote

0 answers

72 views

Calculating $\langle\hat{\phi_i}\rangle_t$ (Blundell's Quantum field theory) (EDITED) [closed]

asked Jan 14, 2023 at 5:03

1 vote

0 answers

70 views

Speed of water at bottom of an inclined plane

asked Feb 8, 2022 at 2:44

1 vote

1 answer

315 views

Time evolution on a tensor product space

asked Aug 3, 2022 at 11:37

1 vote

0 answers

64 views

Expression of $\langle 0 | 0 \rangle _{f,h}$ in the Srednicki's quantum field theory book (eq. (6.21), p.47) [duplicate]

asked Feb 24 at 8:58

1 vote

1 answer

115 views

Why $\sum_n|E_n \rangle \operatorname{exp}(-\beta\mathcal{H})\langle E_n| = \operatorname{exp}(-\beta \mathcal{H})$? (Quantum statistics)

asked Aug 20, 2023 at 10:35

0 votes

0 answers

49 views

How the equivalence principle leads to the idea of curved spacetime? [duplicate]

asked Oct 19, 2023 at 2:04

0 votes

0 answers

48 views

What does the notation $k_B^{\perp} $ ( or $\bar{k}_B^{\perp}$ ) in Peskin's Quantum field theory book (p.105) exactly means?

asked Aug 28, 2023 at 0:31

0 votes

1 answer

767 views

Understanding Griffiths's Electrodynamics Example 8.3 (Electric and magnetic field of a long coaxial cable, etc..)

asked May 7, 2023 at 11:59

0 votes

0 answers

84 views

About a form of general solution to the coupled harmonic oscillators (Marion's book)

asked Aug 10, 2022 at 9:21

0 votes

1 answer

92 views

Question about p.192 in Schwartz, Quantum field theory (Regarding the rewriting of the Majorana mass) [closed]

asked Dec 17, 2022 at 2:37

0 votes

0 answers

215 views

In calculation of Hamiltonian of real scalar field (Quantum field theory Srednicki)

asked Mar 6, 2022 at 3:44

0 votes

1 answer

161 views

Calculating some functional derivative

asked Mar 18, 2022 at 13:26

0 votes

1 answer

2k views

Calculation of velocity of water flowing along inclined plane by applying Navier-Stokes theorem

asked Apr 25, 2022 at 8:13

0 votes

1 answer

311 views

Equations of motion of $\mathcal{L}= - \frac{1}{4}F^{2}_{\mu \nu} - A_{\mu}J_{\mu}$ in momentum space

asked Jul 20, 2022 at 2:56

0 votes

1 answer

81 views

Expression of a Lagrangian in other form

asked Jul 21, 2022 at 3:31

0 votes

0 answers

147 views

Integration appeared in expression of 2-point function

asked Aug 31, 2021 at 12:17

0 votes

0 answers

410 views

Momentum-space Feynman rules (Matthew D. Schwartz, Quantum field Theory and the Standard Model)

asked Dec 17, 2021 at 1:48

0 votes

0 answers

129 views

Formula for calculating the velocity of falling fluid along slope

asked Feb 6, 2022 at 3:44

0 votes

0 answers

170 views

Taylor expansion of some Lagrangian (Understanding the Blundell's Quantum field theory, Example 26.5)

asked Feb 7, 2023 at 11:08

0 votes

1 answer

186 views

Lorentz invariance of the Dirac equation and implicability of the Klein-Gordon equation from the Dirac equation [closed]

asked Feb 10, 2023 at 4:41

-1 votes

2 answers

83 views

How can we obtain an algebraic expression for $\tilde{D}_{R}(p)$? (Peskin's Quantum field theory, p.30)

asked Feb 6, 2023 at 12:32

-2 votes

1 answer

96 views

Why $\langle k,n|\varphi(x)|0\rangle = e^{-ikx} \langle k,n|\varphi(0)|0\rangle$? (Srednicki's Quantum field theory)

asked Dec 25, 2022 at 8:29

-3 votes

1 answer

220 views

Calculating the amplitude for a free particle to propagate from $\mathbf{x_0}$ to $\mathbf{x}$ in nonrelativistic case [closed]

asked Jan 20, 2023 at 10:42

-3 votes

1 answer

95 views

Some calculation in Schwartz's Quantum field theory eq. (16.39)

asked Jul 10 at 11:50

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30 Questions

Please help me to understand calculation of the symmetry factor of Feynman diagrams (Lancaster & Blundell's Quantum field theory)

Schwartz's Quantum field theory (14.100)

Understanding the Griffith, Electrodynamics Example 8.2 (Net force on the northern hemisphere)

Is this formula, other than (2.38) in peskin's quantum field theory, also true?

Understanding Example 36.7 in the Blundell's Quantum field theory

Argument about identical particles

Calculating $\langle\hat{\phi_i}\rangle_t$ (Blundell's Quantum field theory) (EDITED) [closed]

Speed of water at bottom of an inclined plane

Time evolution on a tensor product space

Expression of $\langle 0 | 0 \rangle _{f,h}$ in the Srednicki's quantum field theory book (eq. (6.21), p.47) [duplicate]

Why $\sum_n|E_n \rangle \operatorname{exp}(-\beta\mathcal{H})\langle E_n| = \operatorname{exp}(-\beta \mathcal{H})$? (Quantum statistics)

How the equivalence principle leads to the idea of curved spacetime? [duplicate]

What does the notation $k_B^{\perp} $ ( or $\bar{k}_B^{\perp}$ ) in Peskin's Quantum field theory book (p.105) exactly means?

Understanding Griffiths's Electrodynamics Example 8.3 (Electric and magnetic field of a long coaxial cable, etc..)

About a form of general solution to the coupled harmonic oscillators (Marion's book)

Question about p.192 in Schwartz, Quantum field theory (Regarding the rewriting of the Majorana mass) [closed]

In calculation of Hamiltonian of real scalar field (Quantum field theory Srednicki)

Calculating some functional derivative

Calculation of velocity of water flowing along inclined plane by applying Navier-Stokes theorem

Equations of motion of $\mathcal{L}= - \frac{1}{4}F^{2}_{\mu \nu} - A_{\mu}J_{\mu}$ in momentum space

Expression of a Lagrangian in other form

Integration appeared in expression of 2-point function

Momentum-space Feynman rules (Matthew D. Schwartz, Quantum field Theory and the Standard Model)

Formula for calculating the velocity of falling fluid along slope

Taylor expansion of some Lagrangian (Understanding the Blundell's Quantum field theory, Example 26.5)

Lorentz invariance of the Dirac equation and implicability of the Klein-Gordon equation from the Dirac equation [closed]

How can we obtain an algebraic expression for $\tilde{D}_{R}(p)$? (Peskin's Quantum field theory, p.30)

Why $\langle k,n|\varphi(x)|0\rangle = e^{-ikx} \langle k,n|\varphi(0)|0\rangle$? (Srednicki's Quantum field theory)

Calculating the amplitude for a free particle to propagate from $\mathbf{x_0}$ to $\mathbf{x}$ in nonrelativistic case [closed]

Some calculation in Schwartz's Quantum field theory eq. (16.39)