1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Help on QFT

  1. Aug 14, 2004 #1
    Hi, can anyone give me a clear definition of the following two things

    1) Wilson loop
    2) Spin network (invented by Penrose, right???)

    What do these quantities fysically mean???

    PS : can anyone explain me what the term LOOP means in Loop quantum gravity. To what does it refer ?

    regards
    marlon
     
  2. jcsd
  3. Aug 15, 2004 #2
    Hey Marlon !

    Very intersting issues...that I don't want to pretend I undestand though :wink: But I want to advise you a very good paper on quantum gravity by Carlo Rovelli. This is an entire book, whose draft version is available at :
    http://www.cpt.univ-mrs.fr/~rovelli/rovelli.html

    Anything I could say would be more accurate in this paper. Enjoy ! :tongue2:
     
  4. Aug 15, 2004 #3
    grazie, humanino

    how is life out there in Paris???
     
  5. Aug 15, 2004 #4
    je vous en prie Marlon, c'est mon plaisir

    Another (shorter) paper
    http://www.wordiq.com/definition/Loop_quantum_gravity
    where one can read :
    Should this move to another forum (LQG !!)?
     
  6. Aug 15, 2004 #5
    I took one week out of my thesis. Back to Switzerland Jura ! This is also how I come to have time to read useless things such as LQG :tongue2:

    Could someone elaborate on Penrose and spin network ? :confused:
     
  7. Aug 15, 2004 #6
    I give here the definition of the Wilson loop given by Zinn-Justin in his "QFT & Critical phenomena"

    section 33.3 "Wilson's loop and confinement" (p735)
    [tex]W(C)=\left\langle e^{-ie \oint_{C} A_\mu(s) ds_\mu } \right\rangle[/tex]
    with C a closed loop in space-time. This is a functional integral, and represents the parrallel transporter along the closed loop.

    As for spin network :
    http://www.wordiq.com/definition/Spin_network
     
    Last edited: Aug 15, 2004
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Help on QFT
  1. Help on QFT (Replies: 5)

  2. DFT/QFT help (Replies: 2)

  3. Spin in QFT (Replies: 9)

Loading...