QUASI-PARTICLES IN THE THEORY OF FERMION CONDENSATION

It is shown that Landau's quasiparticle formalism continues to work in systems with a fermion condensate. In the case of a finite system thi s formalism is suitable for describing the restructuring of states at the Fermi surface. It also works in an infinite system, and the idea o f quasiparticles at low temperature as well-defined excitations at the Fermi surface remains valid. The quasiparticle lifetime is directly p roportional to the temperature, and the density of states is inversely proportional to the temperature. (C) 1996 American Institute of Physi cs.