Journal of Physical Studies 11(1), 122–131 (2007)
DOI: https://doi.org/10.30970/jps.11.122

THE INFLUENCE OF WEAK INTERACTION ON THE BOSE-GAS PROPERTIES

I. M. Ilkiv^{1,2}, A. A. Rovenchak^{1}
¹Department for Theoretical Physics, Ivan Franko National University of Lviv,
12 Drahomanov St., Lviv, UA–79005, Ukraine
²High Energy Physics Department, A. Soltan's Institute for Nuclear Studies,
69 Hoża St., Warsaw PL 00–681, Poland

A way to study a weakly-interacting Bose-gas is presented. It is based on the ideal Bose-gas theory and on Bogoliubov`s excitations spectrum for a weakly-nonideal Bose-system. Results for the density of states, the number of particles, the critical temperature and the chemical potential of a weakly-interacting Bose-gas are obtained. The external field influence on the gas behaviour is considered.

PACS number(s): 05.30.Jp, 03.75.Hh