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Light Charge?

  1. Jul 20, 2009 #1
    http://www.physorg.com/news166711942.html" [Broken]

    I was told here that light didn't have an attractive/repulsive force (charge)?
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Jul 20, 2009 #2
    Light by light scattering does not occur only at tree level. Basically, you can have the photons fluctuating simultaneously into two fermion pairs. That forms a closed loop (box) diagram. It's quite interesting and challenging.
    Last edited by a moderator: May 4, 2017
  4. Jul 21, 2009 #3
    Thanks humanino.
    Sorry I didn't realise you were answering my question until I looked up what a fermion was.
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