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Polchinski Eq 3.2.4 and Eq 3.2.5: Deforming contours in path integral

Physics Asked by user175911 on July 22, 2021

Here is the section of the book I’m talking about. I’m confused about the following two points:

  • (i) Why is the path integral oscillatory?

  • (ii) What does it mean, "we can deform contours just as in ordinary integration"?

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