On the Spectrum of a Model Operator in Fock Space

Details On the Spectrum of a Model Operator in Fock Space On the Spectrum of a Model Operator in Fock Space

2008-05-09

arxiv.org/abs/0805.1284v1

Physics

Mathematical Physics

Scientific paper

A model operator $H$ associated to a system describing four particles in interaction, without conservation of the number of particles, is considered. We describe the essential spectrum of $H$ by the spectrum of the channel operators and prove the Hunziker-van Winter-Zhislin (HWZ) theorem for the operator $H.$ We also give some variational principles for boundaries of the essential spectrum and interior eigenvalues.

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