User dsfkgjn

4 votes

1 answer

580 views

Matrix elements $\langle n,k|x|n',k'\rangle$ for Bloch states

asked May 30, 2022 at 6:01

2 votes

1 answer

95 views

Checking if an integral converges (or diverges) using dimensional analysis

asked Nov 7, 2022 at 7:57

2 votes

1 answer

475 views

Proof that the self-energy is an inverse lifetime

asked Jun 28, 2021 at 12:51

2 votes

2 answers

2k views

Does introducing a gauge field into the complex scalar field theory Lagrangian change its dynamics?

asked Oct 19, 2020 at 7:20

2 votes

1 answer

377 views

S-matrix expansion for the $\phi^4$ theory and the interaction picture

asked Jan 13, 2021 at 8:46

2 votes

1 answer

847 views

High temperature expansion of the Ising model - proof of extensivity of free energy

asked Nov 1, 2021 at 14:18

1 vote

1 answer

1k views

Meaning of a strange Feynman diagram for the $\phi^3$ scalar Field theory

asked Jul 1, 2021 at 6:26

0 votes

1 answer

47 views

Best resource for dynamical symmetry of hydrogenic atom and its energy levels

asked Mar 12, 2021 at 10:12

0 votes

1 answer

389 views

Confusion relating to discretizing a Lagrangian and the Fourier transform conventions thereof

asked Jan 6, 2021 at 9:29

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9 Questions

Matrix elements $\langle n,k|x|n',k'\rangle$ for Bloch states

Checking if an integral converges (or diverges) using dimensional analysis

Proof that the self-energy is an inverse lifetime

Does introducing a gauge field into the complex scalar field theory Lagrangian change its dynamics?

S-matrix expansion for the $\phi^4$ theory and the interaction picture

High temperature expansion of the Ising model - proof of extensivity of free energy

Meaning of a strange Feynman diagram for the $\phi^3$ scalar Field theory

Best resource for dynamical symmetry of hydrogenic atom and its energy levels

Confusion relating to discretizing a Lagrangian and the Fourier transform conventions thereof