[ 3 / biz / cgl / ck / diy / fa / ic / jp / lit / sci / vr / vt ] [ index / top / reports ] [ become a patron ] [ status ]
2023-11: Warosu is now out of extended maintenance.

/sci/ - Science & Math

View post   
File: 17 KB, 483x120, pic related.png [View same] [iqdb] [saucenao] [google]
6394943 No.6394943[DELETED]  [Reply] [Original]

I'm trying to relate Feynman diagrams and the Wiener measure. For this I try to translate some of them into the corresponding integrals.

How to evaluate pic related?

Another general question: Can one start with a quantum field theory on a grid, and then make the spatial continoum limit but keep time descrete?
(I figure it might be doable in the path integral case of a Newtonian space time, is it possible there?)

>> No.6395116

<span class="math">[/spoiler]

>> No.6395248
File: 255 KB, 333x750, sexy_Feynman.png [View same] [iqdb] [saucenao] [google]
6395248

Anyone here know how to translate the expression to an integral? I'm in particular not sure about the external photon vertices and how to put all the factors in order --- there are three vertices and in particular if, say, one electron vertex would also have radiative corrections, then clearly the order must matter.
What do the Feynman rules prescribe here?

>> No.6395251
File: 155 KB, 2951x1729, Qed_rules.jpg [View same] [iqdb] [saucenao] [google]
6395251

ment to say
external photon lines*

>> No.6395826

http://www.youtube.com/watch?v=HKTSaezB4p8