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|Type:||Artigo de periódico|
|Title:||Critical Analysis Of The Hard-sphere Model For Superfluid He4. I|
|Abstract:||The basic goal of this paper is to present the theory which stands at the basis of the calculations of the He4 excitation spectrum reported by Wong and Huang. The exact N-particle hard-sphere pseudopotential is constructed through the method of non-local-field operators developed earlier. Keeping only the two-body interaction terms, this pseudopotential replaces the exact two-particle boundary conditions which is demonstrated here and thus has been proposed as a model potential for actual helium-helium interaction in the liquid state. A pair state of the Bogoliubov type is used to calculate the ground-state energy of such a system. An expansion-parameter scheme is presented which drastically simplifies the mathematics involved and justifies previous approximations employed by one of the authors. The expansion describes the dilute case by assuming a large portion of the particles in the zero-momentum state and the dense case by assuming only a negligible portion of the particles in the Bose-Einstein state. © 1978 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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