Geodesic
The group-theoretic analysis of the electron-phonon interaction in metals
Teoretičeskaâ i matematičeskaâ fizika, Tome 95 (1993) no. 3, pp. 478-496 Cet article a éte moissonné depuis la source Math-Net.Ru

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A group-theoretical approach to the construction of the dynamics of a uantized many-particle system with trilinear electron-phonon interaction is proposed. Fermion states are introduced by means of coherent states on the orthogonal group; a Grassmann algebra is not used. This changes the computational formalism of perturbation theory. The derivation of integral equations that determine the parameters of the superconducting state of a two-band model of a metal is considered as an example. 
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L. F. Novikov. The group-theoretic analysis of the electron-phonon interaction in metals. Teoretičeskaâ i matematičeskaâ fizika, Tome 95 (1993) no. 3, pp. 478-496. http://geodesic.mathdoc.fr/item/TMF_1993_95_3_a5/

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