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5
votes
1answer
171 views

Functional derivatives as distributions

I have asked this on math stack exchange, due to its mostly mathemtical content, but aside from one upvote and minimal views it has not garnered any attention, so I am trying here as well. This isn't ...
2
votes
0answers
313 views

Vacuum to vacuum transition amplitude

I have two questions about Vacuum to vacuum transition amplitude. Can any particle stay in $|0\rangle$? I was studying this topic from Srednicki's QFT book. He writes in eq.$(6.22)$ $$\langle0|0 ...
0
votes
0answers
35 views

Difference between functional derivative and virtual variation

I am trying to understand the difference between a functional derivative and a virtual variation. I think I have a decent idea of the virtual variation. It is the instantaneous comparison of a ...
0
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0answers
41 views

Doubts taking the second functional derivative of the Klein Gordon action

I have very little background with functional derivatives and I would like to clarify some issues. I am trying to compute the second functional derivative of the Klein Gordon action expressed in real ...