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Imaginary Time and Path Integrals?

  1. Oct 20, 2009 #1


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    Steven Hawking writes in A Brief History of Time that time itself must sometimes have an imaginary component in order for Feynman's Sum-Over-Histories approach to work. Why, in a nutshell, is this so? Thanks in advance.
  2. jcsd
  3. Oct 20, 2009 #2


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    Convergence of the integral.
  4. Oct 25, 2009 #3
    It is wick rotation, please google "wick rotation",
    you also can find wick rotation in Wiki
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