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VOLUME 21 (1975) | ISSUE 1 | PAGE 3
Contribution to the theory of the spectrum of a Bose system with condensate at small momenta
We obtain a result Σ02(0)—0 that eliminates the divergences in the derivation of a formula for the Green's function of a Bose system with a condensate at small momenta. A simple convergent diagram expression is obtained for 1/c2 (c is the speed of sound). The conditions for the applicability of calculations using a small parameter is discussed.