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Second-order perturbation correction to the Bogoliubov excitation spectrum |
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| Authors: | D.K. Lee |
| Affiliation: | Department of Physics, University of Kansas, Lawrence, Kansas 66044, USA |
| Abstract: | Two substantially different perturbation methods are used to obtain two equivalent exact results for the leading correction to the Bogoliubov formula for the energy spectrum of an elementary excitation in a boson fluid. |
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