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What is Schwinger terms and what is the origin?

  1. Nov 16, 2013 #1
    What is Schwinger terms that related with commutator of currents and what is the origin?Why the infinities appear when we consider the product of operators of fields at the same spacetime point?
     
  2. jcsd
  3. Nov 19, 2013 #2
    The Schwinger term is the gradien of delta function term in commutator of J^0(x) and J^i(y).Then my question is:The infinities appear when we consider loop diagrams,but why the infinities(gradien of delta function) appear in the commutator?Where is the loops?
     
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