On the collective excitations and the existence of the gap in the degenerate Bose gas spectrum

Bulletin of the Lebedev Physics Institute - Tập 37 Số 5 - Trang 145-151 - 2010
В. Б. Бобров1, С. А. Тригер2
1Joint Institute of High Temperatures, Russian Academy of Sciences, Moscow, Russia
2Joint Institute of High Temperatures, Russian Academy of Sciences, ul. Izhorskaya 13/19, Moscow, 127412, Russia

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