Aug 7, 2021 #1 july21 Messages 2 Reaction score 1 TL;DR Summary Hi I would like to ask why we can still do Wick rotations even if \Delta<0 it's from Schwartz qft Last edited: Aug 7, 2021
Aug 7, 2021 #2 vanhees71 Science Advisor Education Advisor Insights Author Messages 24,488 Reaction score 15,057 Just think about where the poles of the integrand are for ##\Delta<0##.