Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I Perturbative coupling for QFT

  1. Oct 23, 2016 #1
    Hi all ,

    I'm confused about the definition of a perturbative coupling for QFT that it should be less than 4 ## \pi ## , because the higher order corrections comes of order ## \lambda / ( 4 \pi ) ## ..

    Now why QCD is not perturvative at low energy because the coupling constant approaches just 1 at this regine ?
     
  2. jcsd
  3. Oct 28, 2016 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted