ON THE SPIN BRANCH OF COLLECTIVE EXCITATIONS OF THE SUPERCONDUCTING FERMI LIQUID WITH S-PAIRING.

Jerzy Czerwonko

Валентин Григорьевич Вакс, Viktor Mikhaĭlovich Galit︠s︡kiĭ, A. I. Larkin

Collective excitations are considered for a system of Fermi particles for which attraction in a state with nonzero angular momentum is predominant. In such a system, beside sound excitations, other collective excitations without a gap in the energy spectrum will exist. The velocity of these excitations can be expressed in terms of the gap in the single-particle excitation spectrum. It is pointed out that the solution for the ground state function with DELTA (n)~Y/sub 22/ (n) is unstable. (auth)

A. V. Tulub

The collective excitati on spectrum in the case of two interacting Fermi- fields is considered, The main approximation is the high density limit in which the correlation energy was calculated. (auth)

É. R. Velibekov