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Title: | Energy and structure of dilute hard- and soft-sphere gases |
Author: | Mazzanti Castrillejo, Ferran Polls Martí, Artur Fabrocini, A. |
Keywords: | Matèria condensada tova Estadística quàntica Mecànica estadística Gas de Bose-Einstein Soft condensed matter Quantum statistics Statistical mechanics Bose-Einstein gas |
Issue Date: | 2003 |
Publisher: | The American Physical Society |
Abstract: | The energy and structure of dilute hard- and soft-sphere Bose gases are systematically studied in the framework of several many-body approaches, such as the variational correlated theory, the Bogoliubov model, and the uniform limit approximation, valid in the weak-interaction regime. When possible, the results are compared with the exact diffusion Monte Carlo ones. Jastrow-type correlation provides a good description of the systems, both hard- and soft-spheres, if the hypernetted chain energy functional is freely minimized and the resulting Euler equation is solved. The study of the soft-sphere potentials confirms the appearance of a dependence of the energy on the shape of the potential at gas paremeter values of x~0.001. For quantities other than the energy, such as the radial distribution functions and the momentum distributions, the dependence appears at any value of x. The occurrence of a maximum in the radial distribution function, in the momentum distribution, and in the excitation spectrum is a natural effect of the correlations when x increases. The asymptotic behaviors of the functions characterizing the structure of the systems are also investigated. The uniform limit approach is very easy to implement and provides a good description of the soft-sphere gas. Its reliability improves when the interaction weakens. |
Note: | Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevA.67.063615 |
It is part of: | Physical Review A, 2003, vol. 67, núm. 6, p. 063615. |
URI: | http://hdl.handle.net/2445/9573 |
Related resource: | http://dx.doi.org/10.1103/PhysRevA.67.063615 |
ISSN: | 1050-2947 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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