Ground and Excited States of a Many-Body System with Singular Interaction
- 15 September 1960
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 119 (6), 2090-2097
- https://doi.org/10.1103/physrev.119.2090
Abstract
The procedure to get ground-state energy and excitation spectrum by looking at the normal modes for the simple excitations of a many-body system is extended and applied to a system with singular interaction. It is shown that the singular two-body interaction can be consistently replaced by the so-called reaction matrix in the equations of motion and in the expressions for the energies of ground and excited states.Keywords
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