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Why in two dimension space many QTFtheory become renormalizable?

  1. Aug 5, 2011 #1
    Please teach me this:
    Why in two dimension space many QTF theories become renormalizable.By the way,are there any relation between this and the world-sheet in string theory?
    Thank you very much in advance
  2. jcsd
  3. Aug 6, 2011 #2
    Because loops now go as [itex]\int d^2 p[/itex] while propagators still go as [itex]p^2[/itex]
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