Timeline for Symmetry factor of Feynman diagram
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 29, 2021 at 10:19 | comment | added | user87745 | @FredericBrünner Even if we hold the external points fixed, we are allowed to swap the two vertices in the loop in the upper part of the diagram because they only connect to internal points, right? What am I missing? | |
| Jun 22, 2014 at 20:46 | comment | added | Frederic Brünner | @user127054: Since the symmetry factor does not say anything about the precise value of the momenta, I would say that the answer is no. | |
| Jun 22, 2014 at 20:44 | comment | added | user127054 | One more question: if we set the external momenta equal to zero, does the symmetry factor change? | |
| Jun 21, 2014 at 16:57 | vote | accept | user127054 | ||
| Jun 21, 2014 at 16:33 | comment | added | Frederic Brünner | @user127054: Not if you hold the external points fixed. | |
| Jun 21, 2014 at 12:16 | comment | added | user127054 | Apart from swapping the propagators in the loop in the upper part of the diagram, are we also allowed to swap the two vertices in the loop in the upper part of the diagram, giving us a symmetry factor of $4$? | |
| Jun 21, 2014 at 8:45 | history | answered | Frederic Brünner | CC BY-SA 3.0 |