Electromagnetism and Feynman diagrams

  • Thread starter Ray
  • Start date
Ray
25
0

Main Question or Discussion Point

1. Feynman says all of electromagnetism follows from Maxwell equations.
2. Somebody (Pointing to a Feynman diagram of a photon/electron reaction) said all of electromagnetism is in that one diagram. So, can anyone help me with these two questions: how does point 1 come from point 2. And, how does a photon come from an EM field just by using it in a Langragian form?
 

Answers and Replies

2,099
16
I remember when I asked one particle physicists, that "how does Coulomb's force follow from that diagram?". The response was "no... we use these to calculate particle collision cross-sections". That's the unpleasant, but simple, truth :wink: You are not getting electromagnetism out of particle exchanges.
 

Related Threads for: Electromagnetism and Feynman diagrams

Replies
3
Views
3K
Replies
0
Views
1K
  • Last Post
Replies
7
Views
19K
Replies
4
Views
8K
  • Last Post
Replies
12
Views
8K
  • Last Post
Replies
4
Views
3K
  • Last Post
Replies
8
Views
2K
Top