Geodesic
Quasiclassical expansion of the Euclidean $P(\varphi)_2$ model
Teoretičeskaâ i matematičeskaâ fizika, Tome 39 (1979) no. 3, pp. 302-306 
I. V. Volovich. Quasiclassical expansion of the Euclidean $P(\varphi)_2$ model. Teoretičeskaâ i matematičeskaâ fizika, Tome 39 (1979) no. 3, pp. 302-306. http://geodesic.mathdoc.fr/item/TMF_1979_39_3_a1/
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     title = {Quasiclassical expansion of the {Euclidean} $P(\varphi)_2$ model},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1979_39_3_a1/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A complete quasiclassical expansion of the Euclidean $P(\varphi)_2$ model of quantum field theory with source is obtained. In particular, it is shown that the expectation value of the Euclidean field satisfies $\langle\Phi(x)\rangle_h\to u(x)$ as $h\to 0$ where $u(x)$, a classical field, is a solution of the equation $\Delta u-m^2u=P'(u)-f(x)$.

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