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What is non/perturbative vacuum

  1. Mar 24, 2006 #1
    Dear PF,

    I have two questions

    What is non-perturbative vacuum? A state - characterized by many non-vanishing condensates? (As explained in wikipedia). In what this non-perturbativeness is manifested when there are non -vanishing condensates? So why such vacuum is calld non-perturbative?

    And I was reading something where was written "In the spontaneous summetry breaking one has to use the symmetry broken vacuum when evaluating the S-matrix" My question is how/why the evaluation of S-matrix is related whether the vacuum is broken or no?

    Always thank you for assistance.
  2. jcsd
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