- #1
babamarysol
- 12
- 0
The generating functional Z[J] depends on \phi_{cl} trough its dependence on J. At the lowest order in perturbation theory the relation between J(x) and \phi_{cl} is just the classical field equation:
\left(\frac{\delta L}{\delta \phi}\right)_{\phi=\phi_{cl}} + J(x) = 0
The question is simple: why this expression for the field equation?
Please help me
\left(\frac{\delta L}{\delta \phi}\right)_{\phi=\phi_{cl}} + J(x) = 0
The question is simple: why this expression for the field equation?
Please help me
