Geodesic
Variational principles and the virial theorem in quantum scattering theory
Teoretičeskaâ i matematičeskaâ fizika, Tome 31 (1977) no. 1, pp. 62-74 Cet article a éte moissonné depuis la source Math-Net.Ru

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Problems concerning some functionals of quantum scattering theory in three-dimensional space are studied. Variation principles for these functionals are formulated. The virial theorem for the continuous spectrum is derived with the aid of one of these variation principles. This theorem makes it possible to obtain a new representation for the spectral shift function. On the basis of this representation the new expression for the second group integral is found. 
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     author = {M. I. Lomonosov and A. E. Oganyan and K. P. Cherkasova},
     title = {Variational principles and the virial theorem in quantum scattering theory},
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M. I. Lomonosov; A. E. Oganyan; K. P. Cherkasova. Variational principles and the virial theorem in quantum scattering theory. Teoretičeskaâ i matematičeskaâ fizika, Tome 31 (1977) no. 1, pp. 62-74. http://geodesic.mathdoc.fr/item/TMF_1977_31_1_a6/

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