摘要: We study the stability of a Bose condensate atomic $^{7}\mathrm{Li}$ in (harmonic oscillator) magnetic trap at nonzero temperatures. In analogy to criterion for neutron star, we conjecture that gas becomes unstable if free energy as function central density cloud has local extremum which conserves number particles. Moreover, show particles point instability decreases with increasing temperature, and temperature interval considered, normal part is stable against fluctuations this point. \textcopyright{} 1996 The American Physical Society.
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