S. N. Lakaev
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The Efimov effect for a model operator associated with the Hamiltonian of a non conserved number of particles
Methods Funct. Anal. Topology 13 (2007), no. 1, 1-16
A model operator associated with the energy operator of a system of three non conserved number of particles is considered. The essential spectrum of the operator is described by the spectrum of a family of the generalized Friedrichs model. It is shown that there are infinitely many eigenvalues lying below the bottom of the essential spectrum, if a generalized Friedrichs model has a zero energy resonance.