التفاصيل البيبلوغرافية
| العنوان: |
On the collective excitations and the existence of the gap in the degenerate Bose gas spectrum. |
| المؤلفون: |
Bobrov, V., Triger, S. |
| المصدر: |
Bulletin of the Lebedev Physics Institute; May2010, Vol. 37 Issue 5, p145-151, 7p |
| مستخلص: |
Themodel of degenerate weakly nonideal Bose gas is considered without the assumption on the C-number nature of creation and annihilation operators of particles in the zero-momentum state. It was shown that the “density-density” Green’s function pole defines the Bogolyubov spectrum of phonon-roton-type collective excitations. The single-particle excitation spectrum is characterized by the gap whose value is defined by the particle density in the “condensate”. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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