New answers tagged analyticity
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Pole at Infinity of a 1-loop scalar bubble diagram
You have to think about it as having to deform your integration contour to avoid the roots $\alpha_\pm$. When you move along the real $s$ axis, the roots move as follows (the arrows indicate ...
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Do we find systems whose Lagrangian is unconstrained, smooth but not analytic?
Well, for what it's worth, in the realm of effective field theories (EFT), say under a RG flow, one may ponder what class of functions the Lagrangian density should belong to, e.g. analytic, $C^{\...
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