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- W3148307528 abstract "In a gas of $N$ interacting bosons, the Hamiltonian $H_c$, obtained by dropping all the interaction terms between free bosons with moment $hbarmathbf{k}nemathbf{0}$, is diagonalized exactly. The resulting eigenstates $|:S,:mathbf{k},:eta:rangle$ depend on two discrete indices $S,:eta=0,:1,:dots$, where $eta$ numerates the emph{quasiphonons} carrying a moment $hbarmathbf{k}$, responsible for transport or dissipation processes. $S$, in turn, numerates a ladder of textquoteleft vacuatextquoteright$:|:S,:mathbf{k},:0:rangle$, with increasing equispaced energies, formed by boson pairs with opposite moment. Passing from one vacuum to another ($Srightarrow Spm1$), results from creation/annihilation of new momentless collective excitations, that we call emph{vacuons}. Exact quasiphonons originate from one of the vacua by textquoteleft creatingtextquoteright$:$an asymmetry in the number of opposite moment bosons. The well known Bogoliubov collective excitations (CEs) are shown to coincide with the exact eigenstates $|:0,:mathbf{k},:eta:rangle$, i.e. with the quasiphonons created from the lowest-level vacuum ($S=0$). All this is discussed, in view of existing or future experimental observations of the vacuons (PBs), a sort of bosonic Cooper pairs, which are the main factor of novelty beyond Bogoliubov theory." @default.
- W3148307528 created "2021-04-13" @default.
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- W3148307528 date "2017-05-01" @default.
- W3148307528 modified "2023-09-30" @default.
- W3148307528 title "Collective excitations in an interacting boson gas beyond Bogoliubov theory" @default.
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- W3148307528 doi "https://doi.org/10.1016/j.physb.2017.02.017" @default.
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