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$\begingroup$ Your answer is really confusing, because you use the same notation $\Gamma$ for the classical action (in the path integral, noted $I$ in Weinberg) and the effective action (the Legendre transform of $W(J)$). I don't think that will help the OP. $\endgroup$

Adam
– Adam

2013-12-05 15:47:56 +00:00
Commented Dec 5, 2013 at 15:47
2

$\begingroup$ The background field method maybe useful, see link neurotheory.columbia.edu/~larry/AbbottActPhysPol82.pdf $\endgroup$

user35289
– user35289

2013-12-07 06:42:14 +00:00
Commented Dec 7, 2013 at 6:42
2

$\begingroup$ You didn't answer OPs question, how is 16.1.7 derived? $\endgroup$

Sounak Sinha
– Sounak Sinha

2020-07-20 09:06:39 +00:00
Commented Jul 20, 2020 at 9:06

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